[lincpimp]

If you still plan to run 6s lipo a 1600kv motor is the best bet. For 5s lipo a 2000kv motor is best. That gives you max motor rpm of around 35k. So gearing will be similar to the stock vehicle, as the nitro motors spin in the mid 30s max.

Start with the samller pinion and work your way up to the performance you want, and check your temps frequently. Tuning by temp is the best way to get a well preforming setup!