my buddy in the USMC has a 03 Civic Si with AEM intake. when he comes back for christmas break hes gonna start modfying it more. hes cant decide wat exhaust he wants but hes thinking about either HKS Hi-power or Spoon N1. i didnt like Spoon N1 too much cuz it made his 92 bubble back sound like a weed wacker. can you guys give some of ur opinions on different exhausts u like and the ones that sound really good. thanks.

Greddy has a rep for having nice deep smooth tones...

DC, Greddy, Invidia, Apexi, HKS, Gozigen.
Greddy has a good sound on DOHC's
as well as Invidia which I have that produces a good sound on my EX as well theType R my friend has.

yea Invidia is a hot exhaust. Im really into the Invidia and Mugen Twin loop exhaust.