I would never get an HKS exhaust... they supposidly make "fake" 3'' exhausts... plus their mufflers bottleneck:
http://www.roadraceengineering.com/e...ustsystems.htm
If I were going to get any exhaust, I'd get something from rnrracing (
www.rnrracing.com). I have their cat-back for my DSM and it's strait as can be, full 3'', SS mandrel bent.