did a few laps with a fellow racers sc10 2wd running a 5.5t on tuesday night, and it did run hot but it was more down to timing settings etc on the speedo,
the truck felt really good with the 5.5 as it flew down the straight but was really well setup and had the punch set low so that it didnt break away every time you touched the power.
So yeah it can be done and it does work, but you will need to have it set up perfectly otherwise it will be a handfull. if you really plan on racing the truck rather than bashing it id stick with the 8.5t range for most tracks or try a 6.5t if its a long open flowing track.
And if you wanna race it then come down to the SCT nationals
and if its not to far come to short course carnage at A1 racing club (grantham)