Gen II · Gen III · Gen IV
All GM engines
Pick your powerplant. Each page covers harness options, emissions choices, and what to send us to start the build.
Handcrafted standalone wiring for GM fuel-injection platforms — Gen II through Gen IV — built one at a time with new wire and genuine GM connectors.
Start a BuildGen II–IVLS Platform Coverage
TXL & GXLLow-Resistance Wire
ECM TunedEvery Harness
Since 1999USA Built
Choose your engine
- TBITBI Wire Harness→
- TPITPI Wire Harness→
- LT1LT1 Wire Harness→
- LT4LT4 Wire Harness→
- LS1LS1 Wire Harness→
- LS6LS6 Wire Harness→
- L29L29 Wire Harness→
- LR4LR4 (4.8) Wire Harness→
- LM7LM7 (5.3) Wire Harness→
- LQ4LQ4 (6.0) Wire Harness→
- LS2LS2 Wire Harness→
- LS3LS3 Wire Harness→
- LS7LS7 Wire Harness→
Not sure which path fits — donor modification, conversion, or a full Pro Wire Harness? Start with Services or tell us the vehicle and engine.