IMO, before dropping $2k on a BBK, go and drive on a track with the current setup to see what you actually need.

That said, if you've got $2k burning a hole in your wallet, you can't really go wrong with a good BBK. Less weight and equal or better performance.

Will the endurance kit fit RPF1 and TC105N, 17x9 +35? Anyone know?

It sure will!