I get that a lot too, but I don't know why my check engin light is on, so on my next day off i'm going to autozone to get all the codes on it.

 

I'll post these tonight....

 

check the October edition of Import Tuner (w/ the orange 240 on the front - at the bottom right it says "beat the law") it has a great article about running cat, no cat, high flow cat etc. and the most gain that they got from going from STOCK cat to test pipe was 2 whp......