Strong rubber tires and a big, smooth parking lot. Good luck, a mamba 4600 on 4s is wayy too much power for my tc3. 5s and a bigger motor is going to be undriveable without serious work, i.e. something like this: http://forums.radiocontrolzone.com/s...d.php?t=238639 .
Cooling the speed control shouldnt be an issue, the 125b's amp rating is so far beyond what youll be able to pull with a little touring car. Though I have no experience with the big quarks.
Your bullet wedge is pretty similar to the protoform lola body I run, which works far better than a normal tc body. A smooth undertray does wonders though.