Just some extra info on other engines I have tried include theTraxxas 2.5 (good top speed), Team Orion .18 Wasp ( average power) and Duratrax .18 (good bottom and mid-range). Next I will be trying the new Ofna Hyper .12 and Megatech Q1.6. Quick update: Tower has the OS .18 for $92.00!! If you want more run time the Ofna Dominator fuel tank (125cc) will fit with minimum changes. Also if you want to lighten the truck up a bit, the Ofna Pirate 10 truck fuel tank (100cc) and battery/receiver box have plenty of room to fit. The pirate 10 wheels/tires are also a good tire alternate. If someone could post instructions on how to post pictures, I would show what some of the set-ups look like.