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Choose EFI main power wiring harnesses from Holley to meet your needs. Several choices are offered—TBI, LS applications, multi-point, and un-terminated harnesses—to feed and carry your engine's electrical supply. Get wired for electronic fuel injection with Holley EFI systems main wiring harnesses.
Not Yet Reviewed
$549.95
$493.95
On Sale
Summit Racing™ offers reproduction wiring harnesses for a wide selection of vehicles, particularly classic cars and trucks from the 1960s and '70s. These replacements and/or extensions are used to power a variety of applications—including horn, glove box, console, backup lights, engine; forward, hood, and courtesy lamps; fuel tank sender, and more. These OE style replacement harnesses are made of high-quality Automotive Grade Wire using factory style fuse blocks, plug ends, and wire colors to ensure factory type fit, performance, and durability. For repair or restoration, order the harness recommended for your specific car or truck. Note: These harnesses are factory replacements and do not include instructions or wiring diagrams refer to the factory diagrams and or service manuals for your specific vehicle.
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$18.99
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$1,505.99
$15.99
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$1,428.99
On Sale
Fleece Performance coolant bypass components are available to service their coolant bypass kits. Depending on the application, these components will be stand-alone items or kits. Keep pushing the limits of diesel performance technology with the Fleece Performance coolant bypass components needed to get you back on the road.
Not Yet Reviewed
$114.99
$97.74
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Holley Dominator EFI vehicle management systems are intended for all engine applications, from street to high-end racing. They have nearly unlimited capabilities to control any power adder, input, or output that you can throw at them. Features include: * 12 sequentially driven 8:2 peak and hold injector drivers capable of driving up to 24 low or high-impedance injectors * 12-channel distributorless ignition outputs capable of directly driving smart ignition coils or Holley DIS coils * Plug-and-play control of factory GM 24x and 58x LSX engines * Integrated electronic transmission control--currently can control GM 4L60E and 4L80E * Integrated dual channel wideband oxygen sensor controls, work with NTK or Bosch sensors * Integrated drive by wire throttle body control, can control two drive by wire throttle bodies * 4-stage progressive nitrous oxide controller * Turbo boost control * Integrated water/methanol injection control * Integrated data acquisition and control allowed with massive amount of programmable inputs and outputs * Internal data logging standard with a huge 2 GB of memory * Self-tuning fuel table strategy greatly simplifies tuning process * Store and change between four calibrations * Individual cylinder fuel and spark control allows you to unlock your engine's potential
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$2,349.95
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$3,399.95
$2,113.95
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$3,058.95
On Sale
All cylinders, all the time! Get the most out of every mile with a Range Technology AFM/DFM Disabler Device. These modules allow your V6 or V8 GM vehicle to run in full cylinder mode at all times. This patented technology is the only product that will disable AFM or DFM without reprogramming the factory ECU. You get full power delivery all the time without factory warranty concerns. Additional features: * No more shuddering or dropping cylinders * Fast and easy setup; simply plug into your onboard OBD-II port and it instantly begins working to eliminate the AFM or DFM system * No tools needed; simply remove to uninstall * All-terrain power and control in any situation—bad weather, off-road, and carrying heavy loads * Safe and reversible: leaves no trace; unplug it to return to factory settings * Fits all V6 and V8 General Motors AFM/DFM vehicles, including cars, trucks, and SUVs * Device is available in multiple color options
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$259.95
$233.95
On Sale
FiTech presents Ultimate LS standalone ECUs. These self-learning ECUs are offered with and without transmission control. So if you're considering utilizing a factory intake, throttle body, and injectors, FiTech Ultimate LS standalone ECUs will get your engine ready for optimal performance.
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$959.00
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$1,202.00
$815.15
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$1,021.70
On Sale
Holley LS coil harnesses are factory replacements for stock LS coils. These EFI LS coil sub harnesses are intended to be used with factory LS coils and various Holley EFI main harnesses with coil-on-plug connectors. They are built with the same high-quality connectors and wire loom found on all Holley EFI harnesses, guaranteeing a perfect match in your engine bay. Are you tired of scouring the junkyard for stock LS coil sub harnesses? Holley has the solution. Holley LS coil harnesses feature: * OEM connectors provide a secure connection between your ECU and Ignition Coils * Techflex F6 braided wire loom keeps your engine bay looking clean, while providing abrasion resistance * Plug-and-play fitment * Can be used to replace a damaged factory coil harness
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$199.95
$179.95
On Sale
GM performance fans will be geeked to learn about MSD's direct plug-in 2-Step launch controls for LS engines. These units are easy to install with factory-style connectors for a splice-free installation. When you're staged, you can hold the pedal to the floor, while the rpm stays at a consistent level, producing consistent launches.
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$349.95
$314.95
On Sale
MSD Street Fire coils will improve the performance of your late model GM or Ford vehicle. The E-core dual connector and TFI coils feature epoxy-filled construction and maximum output voltage. They mount directly in place of the factory coil and accept the factory connectors for an easy installation.
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$46.09
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$599.95
$41.48
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$538.95
On Sale
MSD DynaForce starters are built with all-new components and hand-assembled in the USA. For maximum performance and reliability, all starters are dyno-tested and blueprinted before they leave the factory. The armature is balanced during assembly and is guided by two ball bearings for smooth engagement during thousands of starts. MSD DynaForce starters feature a 3.4 hp motor—and a reduced 4.4:1 gear ratio delivers superior torque to start high-compression race engines up to an 18:1 ratio. They include a downsized housing that clears most headers and oil pans, and a billet aluminum mounting block that can be clocked in different positions for tighter clearance applications. These starters are available in a durable red or black powdercoat finish that's designed for maximum protection while looking good. They use a nickel plated, heavy-duty solenoid for optimum performance in severe environments. Order the model designed for fitment with your vehicle application.
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$424.95
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$641.95
$302.21
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$538.95
On Sale
These MSD Ford Blaster Coil-on-Plug ignition coil packs feature a patented winding design and direct bolt-in replacement. The improved spark energy and voltage of the coil packs, combined with their reliability, have made them a favorite of performance enthusiasts. They are designed as direct bolt-in replacement coils for many SOHC Ford V8 modular engines. The housing and installation are the same as the factory coils, but that is where the similarity ends. Inside the MSD coil packs, engineers used better quality materials to assemble the primary and secondary windings. The MSD Ford Blaster Coil-on-Plug ignition coil packs take the spark energy right out of the coil and put it across the plug gap to improve the combustion and output of the engine.
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$59.25
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$522.95
$38.51
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$469.95
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Finally, all-out performance distributors to replace the OEM GM LT1 Optisparks--MSD's Pro-Billet LT1 distributors. They feature a precision-machined billet aluminum housing that fits in place of the factory piece, a new pickup assembly, a trick timing adjustment mechanism, and a new MSD distributor cap and rotor. The pickup is an advanced optical encoder that has proven to be very reliable and stable through extreme rpm and conditions. The rotor is bolted to a drive assembly that is indexed to the shaft, and is stabilized through the use of a large ball bearing assembly. The distributors use an adjustment screw to advance or retard the timing by up to 5 degrees.
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$799.95
$718.95
On Sale
The next generation Edge Evolution CTS3 programmers will continue to include all of the great features, benefits, and extended coverage from the CTS2 product line, while adding a sleek, new exterior and cutting-edge screen. The Evolution CTS3s reprogram your vehicle's stock computer through the OBDII port, saves the factory files to easily return to stock, and then uploads the Edge calibrations. They come with multiple power levels custom tuned by a whole team of engineers, and can be installed in minutes without ever popping the hood. Edge Evolution CTS3 programmers greatly increase horsepower and torque, and not only re-tunes your vehicle, they stay mounted in the cab of the vehicle offering real-time, monitoring of vital engine and vehicle data for a complete gauge package. Edge Evolution CTS3 programmers feature: * Most comprehensive, state-of-the-art, multi-gauge/tuner touch screen display on the market * 3rd generation design is faster and more capable than ever * Power levels designed for daily driving, towing, performance, and extreme * Simple installation just plug into OBDII port--no wiring required * Monitor key vehicle parameters like transmission temperature, boost, rpm, and dozens more * Full color, 5 in. capacitive touch screen with auto-dimming * Offers crystal clear data at your fingertips * Highly customizable gauges and backgrounds * Boot-up directly to gauge screen upon key cycle * Swipe capability allows easy switching between screens as needed for towing, performance, economy, etc. * Built-in performance meter measures 0 to 60, mile times, and more * Advanced integrated data logger with export capability * Ability to add vehicle licenses to tune multiple vehicles with one product * Clear and read DTC codes * Wi-Fi updateable
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$723.95
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$1,049.95
$650.95
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$943.95
On Sale
DiabloSport Pulsar XT Power Modules are an all-new take on drivability and calibration for your 5.7L Ram Hemi. Unlike any other device on the market, Puls0ar XT is an innovative inline module engineered to keep your factory PCM untouched, with no PCM swap or unlock required. This is the most advanced and easiest way to disable your V8's MDS system to eliminate 4-cylinder mode and keep that Hemi running on all 8, all the time. The built-in throttle pedal sensitivity control also helps you fine-tune your pedal feel to eliminate throttle lag and make your Hemi drive like you want it to. Why spend thousands on different devices and hope they'll work together when Pulsar XT does it all in one simple 15-minute install with state-of-the-art smartphone app control. Enjoy Pulsar XT's shift-on-the-fly pedal programming, with seven levels changeable through your steering wheel controls. The smartphone app allows you to adjust your speedometer for larger tires, transfer case ratio changes, and gear ratio changes—along with adjusting TPMS settings, disabling your Auto Start/Stop, and checking and clearing DTC's. You'll love the way your Ram Hemi reacts with Pulsar XT, with improved throttle response, tire size calibration, and improved drivability running in V8 all the time. (Fits new body style E-Trq and Non E-Trq models.) Additional details: * Disable multi-displacement system to maintain V8 all the time (MDS) * User adjustable throttle booster settings (7 pre-set levels plus factory) * Calibrate for tire sizes 28-40 in. (any size entered above 33.9 in. may disable Park Sense and Blind Spot Monitoring, in some applications) * Improves throttle response and drivability * Disable Engine Auto Start/Stop * Adjust TPMS warning threshold (25-99 psi) * Gear ratio adjust for 2.73-5.38 * Read and clear DTC's * Smartphone app control for Android and IOS * Check emissions readiness status * Enable transmission gear display in Drive Mode * Enable/disable traction control kill * Remember previous Tow/Haul setting on start up *This device is not a power adding device, it is not changing ECM calibrations, and is easily removed for dealer service
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$499.95
$448.95
On Sale
MSD Digital GM high-energy modules with rev limiters allow you to adjust the rpm limit between 5,000 and 9,000 rpm. True high-performance modules built for HEI distributors, they produce 50 percent higher coil drive currents than the stock module. This saturates the coil faster, which gives you more spark energy at top speeds. The results are increased horsepower and rpm range, and improved starting. When used with MSD's HEI coil, these plug-in modules create a potent high-energy spark to 9,000 rpm. MSD GM HEI modules replace all 4-pin modules used in HEI distributors with a vacuum advance canister. They can be used with factory, aftermarket, or MSD HEI distributors.
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$177.95
$160.15
On Sale
JET Powr-Flo mass airflow sensors are designed to deliver improved horsepower, torque, and mileage from your car, truck, or SUV by simply replacing the restrictive stock mass air sensor. The factory sensor not only is a major restrictive point in stock intake systems, but it also limits the full potential of aftermarket cold air intake systems. The flow bench tested design of the JET mass air sensors provide airflow increases of up to 45 percent and installs in 10 minutes or less. They are compatible with other aftermarket upgrades including but not limited to: Performance tuning (chips, modules, etc.), exhaust modifications (cat-back, headers, etc.), cold air intakes, and ignition systems. Order the model designed to fit your needs.
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$149.96
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$337.49
$134.96
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$303.74
On Sale
The Edge EZX module is the next-generation inline performance module engineered for today's most powerful diesel trucks. Designed for simple, plug-and-play installation, the EZX connects directly to your factory system in minutes with no cutting or splicing required. Once installed, you'll unlock on-the-fly power level adjustments using the intuitive Edge smartphone app, giving you total control of your truck's performance right from your phone. Whether you're towing heavy loads, daily driving, or pushing your truck to the limit, the EZX is built to deliver. Enjoy instant throttle response, improved drivability, and up to 1,200 ft-lbs of torque to the tires. Engineered to be emissions safe and warranty-friendly with no trace when removed, the EZX offers safe, reliable power without compromise. NOTE: When paired with the Insight CTS3 in kit form, the two devices still work independently of each other; and the Insight CTS3 will be used for monitoring only. All EZX control is still accomplished via the smartphone app and steering wheel. Product features: * 5 power levels adjustable on-the-fly through steering wheel controls * Engine high idle adjustable through steering wheel controls when in Park * User-adjustable throttle booster settings in each power level via app (Economy, Drive, Sport, Performance, Extreme) * Tire Size Speedo Calibration via app (Up to 40 in. tire size) * Tire Pressure Monitoring Sensors Enable/Disable, Warning On/Off, and Pressure Threshold adjust via app * Gear Ratio Calibration via App * Engine Coolant Protection Enable/Disable via app (Module adds no power until 120 degree ECT, backs down power at 240 degrees ECT) * Button Recall Enable/Disable via app; remembers Tow/Haul and Exhaust Brake settings * Turbo Timer Setup and Enable/Disable via app; once enabled, feature will work on every engine shutoff cycle * Max Cruise set speed adjustable via app (Set max cruise speed at 40-97 mph) * Fog Beams with High Beams Enable/Disable via app * Gear Display in Drive on factory display Enable/Disable via app * Manual DPF Regen via app * Read and clear ECM/TCM diagnostic codes via app * Check Emissions Readiness monitors via app
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$649.95
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$749.95
$529.95
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$673.95
On Sale
These SCT X3 Power Flash programmers store up to three separate custom tunes that can increase horsepower, torque, and even fuel mileage! They feature a huge backlit LCD display for easy viewing of built-in data logging or real-time monitored vehicle data, and popular sensor data such as EGT, air/fuel ratio, and many other sources. The programmers back up your factory PCM program during installation should you ever need to return your vehicle to the stock PCM program. These SCT X3 Power Flash programmers can read and clear diagnostic trouble codes. They have dual analog inputs, user-adjustable vehicle parameters, and include a USB interface cable.
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$379.00
$341.10
On Sale
APR designs their ignition coils to be direct plug-and-play upgrades to your factory coils. They provide greater energy output (by up to 10 percent) that ensures a stronger and more consistent spark and include the coveted red housing made popular by the Audi R8. Enhance both your vehicle's style and performance with APR ignition coils!
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$34.95
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$49.95
$31.46
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$44.95
On Sale
Holley HP EFI smart coil sub harnesses contain two preterminated harnesses designed to work with Holley HP smart coils used on 8-cylinder engines. One end plugs directly into the Holley smart coil, and the other end features a 7-pin Metri-Pak connector that plugs into the Holley universal coil-on-plug harness (HLY-558-307, not included), Holley LSx main harness, or factory GM LSx harnesses.
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$286.95
$258.25
On Sale
Designed to extend your factory coil harness so you can easily remote-mount your ignition coils, these wire assemblies by Holley provide an ideal solution for cleaning up the look of your engine bay. They provide the means for mounting your ignition coils off the valve covers with their OEM connectors that provide a secure connection between your ECU and coils. Get the customization you want with the Holley ignition coil extension harnesses designed for your application.
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$126.95
$114.25
On Sale
New for the Holley Sniper EFI product line is a factory replacement Sniper EFI canister-style ignition coil. This ignition coil is potted with a premium-grade epoxy, making it perfect for high-vibration environments—and it can be mounted in any direction, even if it's horizontal, vertical, or upside down. "No oil" means "no failure" for multiple mounting positions. The Sniper EFI canister coil is perfect for anyone wanting to upgrade their ignition system, while maintaining a factory look under the hood. Features: * Metal canister is epoxy filled to protect the internal coil windings from high-vibration applications * Improved output coil for electronic ignitions, and MSD ignitions (ballast resistor required for points) * 100:1 turns ratio and lower primary resistance produce high-voltage output
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$63.05
$56.75
On Sale
DiabloSport AFM disabler devices allow for maximum power and vehicle performance by disabling the factory Active Fuel Management (AFM) feature that drops cylinders and reduces power. They are compatible with GM vehicles built from 2005 to current that have AFM. With an easy installation--just plug them into the OBDII port under the dash and drive--you can eliminate hesitation on acceleration and the annoying exhaust buzz caused by AFM activation. You can stay in V8 mode at all times without reprogramming or re-flashing the vehicle's onboard computer (ECU).
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$249.95
$224.95
On Sale
Holley EFI Smart Coils are a bolt-in ignition upgrade for your late model HEMI or Coyote engine. Here's the difference over a stock coil: they produce more spark energy while consuming less power without sacrificing voltage output. This means you get hotter spark at the plug to burn the maximum amount of fuel in each cylinder while using less power from your electrical system. Smart Coils are available individually or in sets of 8. * For Coyote or Hemi combinations currently using Holley EFI or Terminator X, use Smart Coil Ignition Harnesses 558-312 and Coil Extension Harnesses 558-326 for a plug-and-play solution. * For new Holley EFI installations on Coyote engines, use with Holley EFI Coyote TI-VCT Main Harness for Smart Coils 558-122 and Smart Coil Ignition Harness 558-312 for a plug-and-play solution. Features: * Direct bolt-on to factory valve covers * Same wiring pinout as other IGN-1A coils for easy plug-in upgrades (Will not work with factory wiring) * More spark energy than any other smart coil on the market for maximum fuel burn during combustion sequence * Low current draw means less demand on the electrical and charging system * Built-in ignitor for compatibility with Holley EFI and many other aftermarket ECUs * Maximum operating voltage of 18 V—for compatibility with both 12 V and 16 V electrical systems found in many performance/race applications
Not Yet Reviewed
$799.95
$718.95
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