Originally Posted by darkangelism
yeah there is no way that will pass in california, no cat is illegal at the fedreal level, but unless the car was impounded for some other reason they would never know.
That being said in some states, not cali, an aftermarket hi-flow cat would be enough to be legal, though you would lose most of the benefit of the new headers.
Are you going to dyno soon? thanks for testing this out first.
Yes I will shortly after I get some copper core spark plugs and gap them. Also have to put my Intake back on. Thinking about actually getting the AEM Cold air intake to compare to the K&N Cold air Ive been testing.
2012 Audi Q7 TDI S Line ABTuning 391whp588wtq
01 Turbo Focus 300+ whp
2012 Focus 19" Niches, AEM CAI, F2 Race Header, 3" Borla Dual Exit, H&Rs, Eibach Sways 183whp157wtq