[4jacks]

2.5" pipe from the cat back to the muffler, and make sure you tell them no resinator... that thing sucks...

Also, a free flow muffler and pipe will not be loud, those ppl that ride around with thier Honda's sounding like bumble bee's, they have to put on a 4 chamber muffler,

I just put a free flow muffler with 2.5" on my civic, it's a LOT quiter than the 2.25" i had on my 2.0 Liter Probe. It's just the engine displacement, there isn't much you can do to make it loud, other than a 4 chamber muffler that sounds like crap.

you can either buy a cat back system, greddy, magnaflow, hks, they all have good bolt on cat back exhaust, $450-$550 ... or you can do like i did and buy a muffler and have midas mandrel bend 2.5" pipe to fit your ride, same hp gains, and a lot less money