i used 2 own a tt01 before the 415 and it made a great drifter. bearings will be the best money spent. Next mod on your list should be prop shaft then pinion and spur which will give the stock motor ALOT more power. I used 2 run a 25 pinion and 55 spur which is the highest you can go without frying shit. after u have those mods you should look at servos, escs, motors and that kind of stuff