I have a 2002 mustang gt coupe.  warranty is just about up and its time to make it faster and set aside from the others that look the same.  My question is whats the best aftermarket exhaust for power and sound.  I have been looking at the rousch packages.  Is that better then out the back.  and if so whats the best pkg deal i can get to replace from the exhaust manifolds out the sides or back which ever is best.  

Mostly personal preference.  I went with Kooks 1-7/8 to 1-3/4 stepped long tubes, catted mid-pipe and Magnaflow cat-back.  Fit great and looks AMAZING.  

upr o/r x pipe with magnaflow magnapack catback...