This Speed Engineering adapter harness allows an LS2 or 1999–2006 GM truck 5-pin mass air flow sensor to be used with an LS1 3-wire MAF harness and IAT sensor. The 8" harness includes an IAT harness.
⚠️ Important Notes:
- Fits MAF sensors 25168491, 25138411, and 15904068
Features:
- Adapts LS1 (3-Wire) Harness to LS2 MAF (5-Wire)
- IAT Harness: Included
- 8" Harness Length
- Compatible MAF Sensors: 25168491, 25138411, 15904068
FAQ
What does this adapter harness do?
It lets an LS2 or 1999–2006 GM truck 5-pin MAF sensor plug into an LS1 3-wire MAF harness, with an IAT harness included.
Which MAF sensors does it fit?
It fits MAF sensors with part numbers 25168491, 25138411, and 15904068.
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).

