In my opinion the 1600-1800kv range of motors are best for 6s (i run a 1515 2.5d- 1700kv) motor in my buggy. Although it is according to if you are racing or just bashing. I find the 1700kv even being a little too snappy for the track and have to watch my gear ratios in order to win a race. Monster Mike runs 5s with his 2.5d for racing. Also the lower kv runs cooler, which is good for pack after pack racing. 2200kv should be fine for bashing though.