Converted T-Maxx's and so far one of them does not wheelie and it has a .25 in it! The other one is just getting broke-in and I don't know what it's going to do yet? My first .21 Maxx had a New Era conversion kit and it wheelies all day long! It had a Duratrax Torq .21 and was a ton of fun! I bought 2 XTM kits last year and put one of them together last year and one this week. The one with the .25 has aluminum A-arms and aluminum rims which are much heavier than stock so, this time I went with as little aluminum as I could get away with to see the difference and soo far it looks like this one is going to be much faster and maybe even wheelie! It has a new Torq .21 in it! I like this engine for a few reasons one being it's cheap to buy and cheap to fix when needed! It also has enough power for the bashing I like to do, it does not have the bottom end of the .25 but, it has better top speed!