houston he has a tmax not a revo....
i would get the 21tm for the tmaxx.. its a lil pricey but it runs great.. shop around see if you find one for cheaper
http://www3.towerhobbies.com/cgi-bin...&I=LXRTM1&P=ML
novarossi do make a version for the tmaxx but its a .15 engine
http://www.amainhobbies.com/product_...axx-Turbo-Plug