i have an 04 3.8L V6 from California. i am trying to buy MAC shorty headers for 99-04 V6's. now the problem is that it's asking me if i wanted: A: 99-04 w/air injection or B: w/o air injection. to start with, i dont even know what that means. and secondly, i dont know if I should get the one w/ air injection or without. so please help guys. i really need this information, coz this is my daily driver and now it's sitting on the street. passenger side headers are cracked , but driver is fine.

oh by the way, i have a custome h-pipe and dual exhaust GT take-off. if that helps in anyway.


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The air injection is smog. Look at your manifolds to see if there is a hose (pipe) connecting to it some place, I'm pretty sure it will have it but look anyway. Doesn't yours have a 3.9? Not that it matters, just wondering because I thought all the 04's had a 3.9.

 

DO NOT GET MAC, they will rust and crack on you. Look into JBA ceramic coated headers, they are less prone to failure.

 

well, it is an 04, but not all 04's 3.9L. mine is 3.8L

 

JBA are way expensive, or shall i say, way over my budget.