What would be your top 3 engines and in what order for what reasons. I hear alot of the LRP engines the ninja MR engines not as much though and the RB and OS engines but don't hear the differences beween them if there is any. I've read that the RB engines are pretty much the favourite and the OS 21 V spec 2 is popular and the VZB. LRP have a spec 3 engine which I hear alot about but not much of the Ninja MR engines.