The Go Tech .21 ran like a champ today. It has more than enough power for a truggy. I'm running it with the 13t cb and 007 pipe. Our track layout requires a lot of torque. The engine has a smooth power band and has excellent mid range power. Also, I changed my diff back to 10k in center before the race. 30k would have been a little much. I ran 7k/10k/3k today. This set up was fine but I will be changing it to 10k/15k/7k. I think this will be the ultimate setup.