Ok, thanks, I'll do some research on those other 2 engines, sounds interesting.

I though the B5 was perfect for a Buggy and the B6 because of it's extra ports and thus power was more for a Truggy?
I read that Jeremy Kortz used the B5 engine in a buggy to take 2nd place at the RC Pro Series Australia race and A-main finish at the 2009 ROAR US Buggy Nationals!