is it possible? because since I installed this AW header... it's leaking and what not... I noticed that my gas needle is going down way faster. I drove 70km and it's at quater tank, before that I pretty much normally did 110-120 at the 1/4 mark. Now that seems totally F'ed up. And no I didn't floor it, normal driving.
Any expert advice on why this could be occuring?

 

I noticed my gas mileage dropped after installing both OBX, then CT headers. I rode the OEM inbetween the two and saw the MPG go up with the OEM and then fall off again when one of the two upgraded headers were installed.

 

brake. stop. disable VSA. now floor the mothasucka.
headers have now redeemed themselves!