2003 Wiring Harness Adapters and Extensions

Harness Adaptors, Holley EFI, LS3 MAP Sensor Adapter, Plug-and-Play, Pre-Terminated, Adapts to LS1/LS2 Engine, Chevy, 5.7L, 6.0L, Each

Part Number: HLY-558-416

4.89 out of 5 stars ( 18 )

Estimated Ship Date: Today

Adapter Harnesses, Holley EFI, MAP Sensor Adapter, 3-pin Delphi GT to 3-pin Delphi M/P 150 Connector, Plug-and-Play, LS Engine Harness, Each

Part Number: HLY-558-467

4.5 out of 5 stars ( 2 )

Estimated Ship Date: Today

Throttle Body Adapter Harness, LS2 Throttle Body to LS1 Vehicle, Each

Part Number: SUM-890106

Not Yet Reviewed

Estimated Ship Date: Today

Throttle Body Adapter Harness, LS2 Throttle Body to LS1 Vehicle, Each

Part Number: CEI-108115

4.1 out of 5 stars ( 10 )

Estimated Ship Date: Today

Map Sensor Adapter, Convert LS Gen III Map Sensor Harness to Gen IV LS Bosch Style Sensor, Chevrolet, Each

Part Number: ICB-WAMAP31-6

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Today

Wiring Harness Adapters and Extensions, MAF Harness Extensions, Delphi/GM, Metri-pack GT Series, 5-pin, 6.00 in. Length, Chevy, Small Block LS, Each

Part Number: ICB-WAMAF33-6

Not Yet Reviewed

Estimated Ship Date: Today

Throttle Body Adapter Harness, 8-Pin LS1 Harness to 6-Pin LS2 Throttle Body Plug, Each

Part Number: TSN-81032

4.5 out of 5 stars ( 4 )

Estimated Ship Date: Today

Map Sensor Adapter, Convert LS Gen III Map Sensor Harness to Gen IV LS Bosch Style Sensor, Nexus Rebel, Chevrolet, Each

Part Number: HTH-HT-186511

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

Harness Adapter, Early to Late GM TPS, Each

Part Number: FST-308022

5.0 out of 5 stars ( 5 )

Estimated Ship Date: Today

Harness Adapter, Nexus Rebel LS, Cable Operated, TPS, IAC, Chevrolet, LS, Each

Part Number: HTH-HT-186504

Not Yet Reviewed

Estimated Ship Date: Today

LS LT Starter Solenoid Wire Adapter

Part Number: ICB-WASTR40

Not Yet Reviewed

Estimated Ship Date: Today

Harness Adapter, Nexus Rebel LS, DBW, 6-Pin, Chevrolet, LS, Each

Part Number: HTH-HT-186505

Not Yet Reviewed

Estimated Ship Date: Today

Mass Air Meter Wiring Adaper, 2005-2010 Slot-Style MAF Sensor in 1996-2004 Mustang, Each

Part Number: JMS-J96040510

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

Adapter LS Gen IV Crankshaft Position Sensor to Gen III Harness - 6

Part Number: ICB-WACKP30-6

Not Yet Reviewed

Estimated Ship Date: Today

Wire Breakout Harness LS1 Gen 3 3-wire MAF to 5-wire LS3 Card Mass Air Sensor

Part Number: ICB-WAMAF32-6

Not Yet Reviewed

Estimated Ship Date: Today

Harness Adapter, Nexus Rebel LS, DBW, 8-Pin, Chevrolet, LS, Each

Part Number: HTH-HT-186506

Not Yet Reviewed

Estimated Ship Date: Today

Map Sensor Adapter, Convert LS1/LS2 Map Sensor to LS3 Sensor, Harness Adapter, Chevy, LS, Each

Part Number: TSN-81033

Not Yet Reviewed

Estimated Ship Date: Today

Map Sensor Adapter, Convert LS Gen III Map Sensor Harness to 3-Bar Brick Style Sensor, Chevrolet, Each

Part Number: ICB-WAMAP30-6

Not Yet Reviewed

Estimated Ship Date: Today

Adapter LS Gen III Crankshaft Position Sensor to Gen IV Harness – 6"

Part Number: ICB-WACKP40-6

Not Yet Reviewed

Estimated Ship Date: May 15, 2026 if ordered today

• Drop Ship
• Special Order

ADAMPER EARLYGYM

Part Number: FST-308029

4.0 out of 5 stars ( 1 )

Estimated Ship Date: Today

Wire Adapter Harness Mass Air MAF LS Gen 4 Truck Tube Style to LS3 Card Style

Part Number: ICB-WAMAF40-6

Not Yet Reviewed

Estimated Ship Date: May 15, 2026 if ordered today

• Drop Ship
• Special Order

Fuel Injector Connector Adapter, USCAR/EV6, OBD II, Each

Part Number: IJD-90-2

Not Yet Reviewed

Estimated Ship Date: May 19, 2026 if ordered today

• Drop Ship
• Special Order

Wire Breakout Harness LS1 Gen 3 3-wire MAF to 5-wire IAT Mass Air Intake Sensor

Part Number: ICB-WAMAF31-6

Not Yet Reviewed

Estimated Ship Date: May 15, 2026 if ordered today

• Drop Ship
• Special Order