I've run two 4900 TrakPower's in my E-CRT. Now, I know I'm using a very inefficient motor (one of those mystery XLT-1's from FD) and I am upgrading this year to either true blue Neu motors or the Castle Flavor Neus but as it stands, at the tracks I race, I can get 12 minutes race pace, I've done 15 twice when I was babying it and way off my normal pace. I'm fairly resolved to try using 6000's and hoping for the best.