k guys i wanna get a fast motor to mess around with. should i go with the novak 4.5 or 3.5. which one is faster. are they good motors? umm any problems to be had? i have the gtb speedo. umm also how much lower would you gear to start out with compared to a 4300. running a 2.60 rollout with the 4300. what kinda of temps? also compared to a brushed motor what turns are they relative to? thanks!