The 2650Kv setup is a missile in buggy, a controllable one though. I would say if you have gearing issues though on your vehicle (ie- only so low you can go with pinions), go with the lower KV 2200Kv motor. It is a bigger motor so its heavier, but the power we can put out with these vehicles I don't think its that much of an issue compared to battery pack weight.
Jason@Maxamps did a good job with his 2650Kv once he got it setup to his liking. I run the 2200Kv in Truggy and its a beast.
