If you want serious power for your bike spend the money and get this one. With my Bazzaz fuel control and this Exhaust on my 09 zx10r, I put down enough HP to beat out 2005-06 Hyabusa's on the Dyno shootout. Installation was simple. The Cat delete had some issues with fitment but other than that it was easy. Sound is very Deep and Throaty, People know you are coming but it doesnt give you a headache during long trips. My Tip save your money and go with the best.