header swap question

[perna00]

true, but mine is cali spec. it had 3 separate cats. now it has only one and i noticed a nice difference in power when i changed everything. the cat i have now is still breaking down pollution enough not to throw a ses light for lack of the catalyst's breakdown. don't get me wrong, i'm not trying to argue with you. i had a cavalier that the high flow converter #$%@ed up and lost all horsepower cause of. it seems to work well with my spyders application though.