Originally Posted by Celinicus

Intake is easy (generally)

I, personally, wouldn't mess with the cats myself. First they're a bitch to get off apparently and secondly if there ends up being a fitment issue (exhaust rubbing) you might be hard pressed to fix it yourself. Then again, if it's just cats there probably won't be an issue but if you start adding a y pipe and catback the chances of having some funky problem with rubbing and rattling go up. Just my two cents.