I need some advise. Today I ordered the 4*40 kit from my local hobby shop and I told the salesman I wasn't sure on the engine to put in it and he said the evolution .46 would be a nice engine. I told him I would do some research and let him know, so what do you all think about this engine for the 4 star, how does it compare to the OS .46 FX or AX performance wise. Thanks for any info and I am open to any suggestions on types of engines to use.