I haven't tried the modded version but I can tell you that the 528 8 port is the most powerful motor I've ever tested. It completely blows away everything else in the truggy classs including all the .32 engines. I don't know why you'd want a modded version as the stock version has so much power that you'll be struggling to get it to the ground.

I ran a 528 hotmod in april, sold it in May. The CRT could not put it to use and it blew tires apart. I run a RB 928 and a C6 BB now and they are much easier to use but they both seem so slow since iv'e taisted the blood of the vampire. I think I will end up with another one some day. They get great run time cause all your doing is blipping the throttle and coasting for forty feet. You have to time it just right so you have enough speed to finish a turn cause if you hit the throttle in a corner your tires are up in smoke (er dirt) This is with a 17 tooth clutch bell!