Originally Posted by Sidez
I just had my cats removed and used stock sizing... I think I made a mistake for some reason... is it possible to loose performance by using stock size instead of the rear cats or am I just loosing my mind..? I used stainless steal pipe by the way...
No, but it is probable / possible to lose performance by removing your cats without altering the signal sent to the ECU by your second bank 02 sensors... If you are feeling less power after removing your cats, it could be that the secondary 02 sensors are sniffing more unburnt fuel than oxygen and trimming your fuel back and retarding your timing...
I'm testing a GIZMO this weekend that Woody built that in theory, should trick the sensors into thinking that there is more oxygen than fuel and richen the fuel mixture and advance the timing... I'll have results posted by Sunday night...