Thanks for the reply man!
I have a Shen, and 2 "rally racers" which *seem* to be made by Shen - but I guess I'll find out when I try to stuff a 3.8 in it! The Shen's and rally racers had more powerful motors than the LXX clones i just got. (which supposedly had 3.0's in them. I havent tried the LXX 3.0's on the Shen, maybe the PCB on the LXX is just junk.