well if you want to compete wit ha warhead, your headed into monster trucks. what do you want to do with the truck? bash, race, both? i drive a revo. i got it when it first came out. put a 3.3 into it as soon as those came out. most powerful truck ive ever seen. none of the big block trucks compete wit hthe high reving 3.3. savage is good for bashing too. a little cheaper. so is a T-Maxx 2.5R or 3.3. i wouldnt recomend a warhead. ive heard they have very bad engine problems. get back to me on what you want to do with the truck and i can help you more