I replaced the stock servo for a hitec 625 servo now I need a faster motor...17turns and up gimme some ideas thx

Have you tried a seven cell batt yet?

Before you get a faster motor you should get an electronic speed control. Get one that can handle down to 12-14 turns. That should be enough so you won't have to upgrade later on. I would suggest getting a competition stock motor like a P2K or other. I haven't been into electrics for quite a while so I'm not sure which motors are the "best" ones now. Another way to get faster is getting some low loss connectors. I had Deans Ultra Plugs when I had a stampede and they did get me a noticable difference in speed. Don't bother with bearings, the ones in the wheels are too small and break with the slightest hit.