My 650 had Vance and Hines true dual exhaust with a k&n air filter and rejected carbs. I'd suggest determining exactly what you're wanting to accomplish with it, and go from there. There's several good places on the internet to shop. For me, Amazon lately has some very competitive prices. Ive also used phat performance out west, and eBay. If you have the time to shop around, you can save some money. I just upgraded my 950t, and saved between $300-$600. Keep us updated on your progress.