i second that for magnaflow!
if you dont get a resonator, you will sound like an airplane. an i4 is going to sound harsher than a v6 will with the same setup.
as far as resonators go- find a good exhaust shop and have them install whatever they got- it doesnt really matter unless you are going for all out performance. a resonator will also help to maintain backpressure so you wont lose low end.
i would personally recommend getting a custom setup from a shop that you know does good work. most performance mufflers have a straight-through design meaning its not going to block much sound at all...
this is my setup:
-2.5" from cat w/ generic resonator in the middle
-Y pipe to 2.25" pipes
-magnaflow street series mufflers with 4" tips and 2.25" inlets.
for my needs, my exhaust is perfect- it never gets so loud that you have to talk over it inside the cabin. at 2800 or so rpm it goes almost silent, so cruising anywhere above 65 is comparable to a stock exhaust in terms of sound. however there is a nice "hum" to it, specially at lower rpms. it sounds like a sport tuned exhaust and it is all custom.
jon
EDIT: 1000 posts!!!
