ive got the magnaflow muffler and cat, stainless steel piping, it sounds amazing, it gives it that deep mean sound without being obnoxiously loud, love it, but if you do add exhaust and change the cat the engine will through a code because it thinks theres a hole in the cat because to much air is going through it, so your going to need a resister to trick the ecu so your check engine light dosnt come on, heres the link to one,
http://www.afterthou....com/o2sim.html , or you could build it yourself for much less,
http://www.paladinmi...LEliminator.htm