exhause combo need help!

ok i have a flowmaster american thunder cat-back system and was lookin into a pypes performance cated x-pipe i was woundering how much louder that would make my car and if you have any opnions on their products or any suggestions of a better cated x-pipe. i need the cats since i live in pennsylvania and need emisions and i dont feel like changin it off for the test once a year or else i wold go with the o/r pipes.
thanx,
Frank
 
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I dont know about that companies quality, however there are a lot of companies that people on here like a lot. Me I'm partial to Bassani. Kinda expensive but worth the price, also upr makes pretty nice parts, (not sure about catted one though), magnaflow is great quality also, and lots of people like the mac X. Most will say they dont like the bbk stuff, I dont care for there exhaust products. And it WILL deffinately make the exhaust note louder, not as loud as off road of course but a good amount louder.