i just got a 93 seadoo xp with a 657 dual carb motor,all stock from what i can see, it might have after markert impeller not sure, and i want to know how fast they are, and the rev limiter is at 7,050 rpms right? do they have a pretty good hull shot eneough to pull a tuber, top speed?, and does the VTS sytem actually help get up on plane and better handleing?