just got a megan header and ordering a megan cat back exhaust both for an ex cause im doin a mini me swap (car is an hx) was lookin at high flow cats on ebay and was wondering if the cheap ones work just as good as a name brand expensive one and also how many sensor holes if any does it need to have? thanks!

 

you gots most excellent parts right now. why screw it up with the cheap stuff?

get a magnaflow hi flo cat and leave it at that.