trf511 questions

[qatmix]

I'm pondering getting a trf511 due to sell ing stuff on evilbay but just have a few questions..

What are the essential hop-ups? I know on my 501x the front one way transformed the steering of the car. Does the 511 need this also?

Can I transfer parts from the 501x to the 511?

Is it worth me really getting one over my 501x as I'm not racing nationals etc and my 501x is a loverly car.