ugh....sound good, but no performance help....
well I\'ll help you anyway. You will want to forget about Flowmaster, unless you want a constant drone in the cabin. They sound great on v8\'s, but suck for 4 bangers.
Borla is arguably one of the best mufflers in the world, but I don\'t know the exact cost, probably about 200 bucks. Apexi is alright. Alot of mopar guy\'s like dynomax, but I\'d go with Borla.
You should have mandrel bent 2 1/4" pipping which isn\'t that restrictive, considering you\'re not pushing out any 300hp, so you shouldn\'t worry about new pipes.
But if you do go and get a new downpipe, don\'t go above 2.5" you may loose back pressure, and thus you\'ll loose your low end.
I use a magnaflow straight muffler (no baffeling)on my car, I also have a 2.5" downpipe, luckily I don\'t have to worry about back pressure due to a turbo charged engine. (I\'ve been pulling 13\'s but I\'ll be in the 12\'s by December)