Engines for off road actualy have less low end. A well setup truck can carry a lot of speed through corners, but when you are accelerating from a standstill you need to baby it untill the weight of the car has shifted to the rear of the car before you realy get on the throtle. The .12 cvr is the way to go. It will give you enough power to pull wheelies down most of the track and yet it won't be uncontrollable power on a low traction track. If you are running on a track that features 200+ft. straights then the new drake platinum editions may be the way to go. They have a powerband similar to the cv-r, but they rev a lot higher. I have been running with nothing but an o.s. cv and have been very fast on a smaller track just because it's all I need on the track.