Hi everyone,
I'm a newbie wanting to build my first Flame Wheel ever. I just recieve my F550 Kit and I want to upgrade their amrs to a more stiffer one. Could you please advise me should I choose X55 or X50, as X55 are 50mm longer than the original which is good for my future plan. But I don't know if it affect the flying performance of the system or not? And should I upgrade to E310 props?

Thank you very much.

The 50 mm longer arms will not affect your flying performance.
Yes the E310 props are a good upgrade.