I would love to get a .21, it's for a hyper st which is heavier than most truggies (atleast that's what i'v been reading). If a good .21 wouldn't have a problem with sending that baby over the jumps that's what i'll go with but for right now i'm just looking for a ok motor with some tourqe. I'm am new to the truggy racing but not nitro so i'm trying to get some good ideas.