i just recently put my warpspeed y-pipe on, and for some strange reason my car is giving me horable gas milage. i mean i could practialy start the car walk inside for 2 mins and come back out and the needle would have droped a little. could this be because of my y-pipe? or could somthing else be wrong?

 

examine your o2 sensors..see if you disconneted a wire.

 

reset ur ecu