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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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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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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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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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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
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
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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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
Tune-up your Ford 7.3L Godzilla with MSD's direct-replacement coils. MSD is the ignition leader for performance parts that stay within your budget. These coils are available in black or red, individually or in a set of eight. Additional details: * Direct bolt-on to factory valve covers * Improved high-RPM operation * Patented winding design and materials * Direct plug-in to factory connectors
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$472.95
$424.95
On Sale
As LS engines make their way onto the race track MSD is ready with the Circle Track LS ignition controls. You're off to the races with MSD. Circle Track LS ignition controls feature: * Direct plug-in to factory GM LS sensors and coils * Preprogrammed to run the GM CT525 crate engine out of the box * Laptop programmable rpm limit, timing curve, and coil selection for custom tuning * Auto detects coils, cam sensor, and crank sensor * Will run 24x 1x, 58x 1x, and 58x 4x crank/cam sensor combinations * Self-powered with USB for laptop programming * Steady, accurate timing control * Dedicated plug for Tech Official
Not Yet Reviewed
$549.95
$493.95
On Sale
Range Technology Pulsar LT modules offer complete adjustability of many features, all from your steering wheel controls. Without modifying your truck's ECM, Pulsar LT affords you the ability to adjust throttle response, tire size, gear ratio, TPMS, and can be used to disable Auto Start/Stop. It connects directly to the vehicle computer system, making installation a breeze and leaving your factory warranty intact. Select the Range Technology Pulsar LT module designed for your vehicle. Features: * Disable Active Fuel Management and Dynamic Fuel Management (AFM/DFM) * Disable Auto Start/Stop * Calibrate speedometer for larger tires * Speed limiter adjustment * Adjust TPMS settings * Modify gear ratio * Clear DTCs * Throttle booster with on-the-fly adjustment * Manual DPF regeneration * Engine idle up * Transmission relearn Note: Features vary by vehicle model/engine.
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Holley drive-by-wire throttle body wiring harnesses are designed for use with the Holley Dominator ECU, as well as the factory drive-by-wire throttle body. These harnesses feature pre-terminated connections, ensuring true plug-n-play installation.
Not Yet Reviewed
$474.95
$426.95
On Sale
Edge Diesel Evolution CS2 programmers connect to your factory computer via the OBDII/diagnostic port and can read and display up to eight parameters at a time from a list of dozens of available engine parameters. These awesome CS2 units work not just as programmers, but also as scan tools and gauges, making them a 3-in-one value! Edge Products Evolution CS2 programmers feature a full-color, high-resolution 2.4 in. button-controlled screen.
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$499.95
$448.95
On Sale
DiabloSport offers high output ignition coils for a wide range of vehicles, including many Jeep, Ram, and Dodge cars and trucks from 2005 and up. They are an upgrade over stock coils for the 5.7, 6.1, 6.2, and 6.4 Hemi applications. DiabloSport found gains when installing these replacement coils on late model applications, and you can expect the same. Better throttle response, improved cold starts, and increased power output are the result of high efficiency windings that make use of better design and materials than the OEM units. The stock replacement design makes them a quick and easy installation on most applications. Order individually or in a set of 8. Product features: * High output coil upgrade * Upgraded internal materials and design * Improve power output * Works on most 2005-current Hemi applications * Factory replacement design * Simple installation * Great upgrade for older, high-mile coils * Gains of 7.8 RWHP on 2016 Hellcat at Stock Boost Level
Not Yet Reviewed
$599.95
$389.95
On Sale
K&N throttle control modules are designed to improve throttle response and acceleration, as well as pedal sensitivity without modifying factory ECU settings. These modules process input data from the gas pedal and bypasses the factory signal to your vehicle's ECU, sending a modified signal directly to the throttle body. This creates an increase in throttle responsiveness that will make your car feel like a whole new machine. Features and benefits: * Easy plug-and-play installation * No software required and can be tuned on the go * Sends a modified signal directly to the throttle body * Includes the module, wiring harness, adjustable dial, hardware, and instructions
Not Yet Reviewed
$314.99
$264.99
On Sale
Holley EFI Smart Coils are a bolt-in ignition upgrade for your Gen III 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. The Smart Coils are available individually and in sets of 8. * For 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. 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
$702.95
$456.95
On Sale
DiabloSport Predator 2 flash programmers are back on the prowl! They feature slim, sleek case designs that fit nicely in the palm of your hand--and offer users tremendous performance gains, an unprecedented collection of adjustable options, advanced data logging capabilities, and a lot more. You'll appreciate the Predator 2 full-color, button-controlled screen with improved user interface, and the programmers come loaded with everything you need right out of the box. Get ready to optimize your driving experience with DiabloSport Predator 2 flash programmers. Order the model designed for your vehicle application. Features include: * Performance programs add horsepower and economy * User-adjustable options like tire size, gears, shifting, and more * High-speed OBD-II data logging * Reads/clears diagnostic codes * USB for updates and downloads * Saves stock tune and can easily restore the vehicle back to factory settings * Supports domestic gas and diesel, cars and trucks
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On Sale
Dinantronics X kits are designed to extract maximum power out of a completely stock vehicle and those with basic bolt-on modifications without having to alter the factory engine programming. Dinan Dinantronics X Performance tuners are Bluetooth smart and offer convenient access to the adjustment of power levels directly from the palm of your hand. Advancing beyond their predecessors, X tuners connect to additional inputs and/or have a more refined tuning strategy, yielding more power as a result. For those that do not wish to (or can't) alter their stock ECU with a more robust engine flash, Dinan's Dinantronics X units are perfect alternatives to satisfy the craving for "more". Dinan Dinantronics X Performance tuners will take your engine's performance to levels that stock programming cannot, and they do it without affecting long term reliability or the functionality of on-board diagnostic systems when run under recommended operating variables. Whichever level of engine tuning is ultimately chosen you can be sure you will be pleased by the result. Features and benefits: * Bluetooth smart (Android and iOS Compatible) * App download/pairing process detailed within the installation instructions * Seven power levels and a bypass setting to choose from * Smooth and predictable power delivery * On-board diagnostics and factory safeguards maintained * Unaffected by dealer factory updates * Plug-and-play installation * 14-day satisfaction guarantee * 1-year limited warranty
Not Yet Reviewed
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$357.95
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On Sale
The XDR Off-Road Delta Boost tuner modules are a simple way to gain up to four psi in boost pressure with an easy to install plug-and-play unit—which results in horsepower and torque gains throughout the useable rpm range to accelerate you past the competition. The modules simply install in-line with the boost sensor in the factory harness and is controlled by a downloadable Bluetooth app for both IOS and Android platforms. The app shows you real-time boost pressures and offers four different power settings; Valet mode, which is great when handing off the keys to a less experienced driver, Standard mode is the equivalent to stock boost setting, Sport mode gains up to three psi over the stock boost and Maximum mode gives you an added four psi over stock boost—so you can shred the trail. Modules are fully sealed from moisture and dirt and comes with rubber weatherproof capsule. Detailed installation instructions and apps are downloadable for a quick and easy installation.
Not Yet Reviewed
$549.95
$302.95
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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$729.95
$529.95
On Sale
GM performance fans will be geeked to learn about MSD's direct plug-in 2-Step launch controls for Gen V LT 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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$361.95
$325.75
On Sale
Summit Racing Equipment® offers wiring harnesses for a wide range of vehicles—including many Chevrolet, Pontiac, Oldsmobile, and American Motors models from the 1960s and '70s. The factory-style replacement harnesses are ideal for restoration and upgrade projects. They are available to connect and power up a variety of dashboard and accessory functions. Order the wiring harness recommended for your application.
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