Hey i can't find the thread right now but I've read multiple places that the stock catback was good for I believe around 300whp which I can understand when it splits at the y everything after that should be good to go but, before the y the resonator sections is only 2.25 I believe and then if that's the case would that not be a restriction? If 2.25 isn't a restriction everyone would just keep there stock downpipe right?

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