I want to purchase a mid-class ATV. I can not decide between a 1.sportsman 400 2.kawasaki prarie 400 4x4 3.arctic cat 375 4x4 4. suzuki eiger 400 4x4.

Does anyone know the top speed of these?
Can any of the atv's pop wheelies?
Would a K&N power kit really help the power?

Please Help!!!