i've got a mammoth, and i must say, that it is absolutely the fastest and well handling mt i've drove...just sold a .21 tmaxx, glad i did, because the mammoth is twice the truck...and i cant say enough about the xtm motor...it starts almost every time on the first or second pull, and talk about strong...i also did much research before i bought, because i was so displeased w/ the tmaxx mod, for the price you cant beat it...hope this helps!