Garrett22..........If it is tuned correctly and he is a decent rider it will eat our 700xx's easily in a drag race. They have up to 855 kits for those Rotax engines in the DS 650 and it will really make them walk the dog!! If it were not for the XX's being $4500 out the door, IRS, FI, and rewind my DS would already have a 720 or 730 kit and I would be satisfied horsepower wise but stuck with out rewind. For now though I love the IRS, FI, and reverse, but grumpy about the lack of power my XX has with the Big 3. The XX will eventually get some compression and headwork if not some additional cc's.