Akrapovic (sounds like a-crop-o-vich) is one of; if not, the best exhaust systems around. The QUALITY and PERFORMANCE are well worth the money. When you're ready, go with Spencer Cycle, I did and saved alot of money. However, I wouldn't expect you to take my word for it, get pricing and then compare w/Doug @ Spencer, you'll be glad you did!
"Remember the 40/60 rule..."
Cherbm3, a.k.a. "Bomb"