Any thoughts on the best engine for an RXB? Is it correct that I have to stay at or below 21 for racing? I am not worried about that too much, but wanted to be sure I knew. I am looking for something with tons of low end power and good high rpm capability to open up the top speed. Something that holds a tune well. I am thinking maybe between $150 and $250.

I have thought about the XTM 457, the SH28 Pro, the SH 21 Pro Buggy and a basic SH28 3 port with the XTM 457 sleeve.

I am also curious about OS, but my thought is that they are not as good a value (more $ for the same performance).

I would also like input about Go, Axial, HPI, LRP and anything else you think worth mentioning.

Thanks!