i used to have savage nitro then got flux and new geting a truggy but the best engine i would say for that would be the http://www3.towerhobbies.com/cgi-bin/wti0005p?&I=AXIG0001&P=X
this the Axial .28 Spec 1S Engine Green engine very good very fast and you can get parts from all over the net. Thanks goose