[suicideneil]

What performance are you looking for exactly? Bashing, racing? Small track or large track? Speed runs? Grass or dirt?

The 2650kv motor is better suited to 3s really in 1/8 buggies for racing, that's a popular setup- the 1800kv motor would be a rocket on 4-5s too. The 2200kv motor is really better suited to either truggies or MTs on 4-5s. If you wanted to run 5-6s in a buggy, you'd have issues fitting the batts for starters, and you'd also want a ~1400kv motor, so you should be looking at tekin motors perhaps..