OS .18 TZ is one of the highest if not the highest HP .18 on the market and you better have the drive train beefed up where it will take it! All so I think it is going to be way too much power on the track but I will see. They cost around $210 depending on which one you get. This it the one I have and if I had it to do all over I would get one with out the pull starter and use my starter box. I would all so get it with the slide carburetor but I have had this engine for over a year before installing it and got a pretty good deal on it. It has as much HP as some big blocks!

http://www2.towerhobbies.com/cgi-bin...?&I=LXHLV9&P=0
All so check this out.
http://www.osengines.com/reviews/osm...st-rcnitro.pdf