I would much rather run multiple classes than have 2 of the same cars for dedicated surfaces. Even if u race the 22 on both surfaces i am sure u could get the car at least competitive with minor adjustments as opposed to having a completely seperate car, at least for my skill level anyway...i would get the xb4 now and see if u really need another 22 down the road and if u have to have another one at least it gives u a little more time to save up