I have a question I currently run a JPX.21 jammin in my Losi 8 buggy my son is in the market for a new mill for his Losi I am extremely happy with my JPX.21 but I have been hearing great things about the GO engines. Which GO engine is close or pretty much the same as a JPX? and how much does it cost? he really wants ninja like power are there any GO's that are affordable and reliable like them? if so we will buy one Thanks.