I run a Lrp tc spec v1 and lrp x-20 8.5 geared with 21 on a med to hight bight large indoor track and run consistent 23-24 sec lap times with the record being in low to mid 22's from some of the best drivers in the state.now that I have got the car dialed in its time to go to the 6.5 to try and shave off that last one to two seconds.