I'm using the Novak #5460 6v limiter now on my Truggy. I'm going to put that 2100 mah Li-po and regulator on my buggy and go to this XVR 6.7v regulator that is designed specifically for the spektrum rx. More voltage equals faster speed and more torque.

http://www.vxrracingusa.com/prodM_re...r_lvr-5000.htm