umm..... i was asking for a comparison between 4-tec and tc3. Mugen was not involed at all. y i am asking between the two cars i stated in the original thread, is because one is belt and one is shaft, another reason is i want fun around the neiborhood and for people there to say wooh! that thing is awesome. i also want to do good in racing though. this will be my first at a road course though. ive been cruisin' w/my off-road and oval. but im not sure w/ these traxxas engines either, i had one for my rustler(i mean it had its last harah drag racing) it lasted for about a year(didnt drive it for about 6 of those 12 months). now ive moved on to an o.s. .15cv. and the traxxas is belt too, how will this last on my pavement for the neiborhood? but as u said the tc3 is for racing, (but its shaft so will last longer on pavement). im a begginner at road, so wats for me?