question with exhaust...help the noob plz
 

ok guys, i really want a dual exhaust. all i know so far is that my car is stock and i will need an adapter to turn it into a dual exhaust, and i will also need some exhaust pipes, i heard bassani was good, but expensive, i also have heard that flowmasters were pretty good. so any input here would be helpfull...so my real question is: which dual exhaust kit should i go for? and which set of dual exhaust pipes should i get? will i need to modify/replace my bumper in back for the dual exhaust? any info here would help guys, thanks

-phantom