[glassdoctor]

I don't think you need or should run a 4.5 motor... or maybe even a 5.5 if you are serious about racing. A 6.5 on lipo is already stupid fast on a track. Just my opinion.

I have seen some 5.5 run in trucks but most of the guys say it's too much and they dial it back. So I say the 5.5 and be ready to calm it down.... slow is fast. ;)