I just recently got my RC10B4.1 and was wondering about some stuff.

I just took my car out for the first time today and it was fun running it but I notice when I tried turning both rear wheels together, it was very tight and when I ran it I notice the noise sounded like screeching and gotten louder than box stock.

I also don't like the servo from box stock, just slow and radius is horrible. I was wondering on what you guys recommend to replace in the B4.1?
Is the savox sc-1257TG recommended? It's fast, titanium gears, and high torque for this 2wd car. Also does anyone know if I need a BEC or whatever? I notice in my vorza I needed one since it would shutoff randomly and come back.

Thanks