This Speed Engineering adapter harness connects an LS1 3-wire mass air flow harness, as found on 1997–2002 LS1 Camaros and Corvettes, to a Gen 3 LS MAF sensor of the type commonly found on 1999–2006 GM trucks and SUVs. It is often used when converting from the smaller 78mm 3-wire MAF to the larger 85mm 5-wire MAF with integrated IAT sensor. The 8" harness includes an IAT harness.
⚠️ Important Notes:
- Fits MAF sensors with part numbers 25168491 and 25138411
Features:
- Adapts LS1 (3-Wire) Harness to Gen 3 LS MAF: 78mm 3-wire to 85mm 5-wire MAF/IAT
- IAT Harness: Included
- 8" Harness Length
- Compatible MAF Sensors: 25168491 and 25138411
FAQ
What does this adapter harness do?
It connects an LS1 3-wire MAF harness to a Gen 3 LS 5-wire MAF sensor with integrated IAT, commonly used when upgrading from a 78mm MAF to an 85mm MAF.
Which MAF sensors does it fit?
It fits MAF sensors with part numbers 25168491 and 25138411.
Does it include an IAT connection?
Yes. The adapter includes an IAT harness.
How long is the harness?
The adapter harness is 8" long.
Is this part street legal?
No. Speed Engineering sells this adapter harness as a race-only product intended for competition use only. Installation on a street-driven vehicle may violate the Clean Air Act (42 U.S.C. 7522(a)(3)).
⚠️ Race Use Only: This product is manufactured and sold for installation on vehicles used solely for competition. Once installed, the vehicle may not be used, registered, or licensed for use on a public road or highway. Installation on a street-driven vehicle may violate the Clean Air Act 203(a)(3), 42 U.S.C. 7522(a)(3).
