Whoa! steady on kids, I didn't want this to turn into a physics debate.

I now know that (A), a post 2013 Rt sway bar is stiffer than the stock F3 and will improve handling.

And (B), the Baja Ron bar is better still, with an even greater degree of improvement to handling.

This is all I needed to know, so I am going to try an RT bar first because I can get one for next to nowt and if I feel the need, I'll shell out the bigger bucks and score one of Ron's bars.

Some great info on here by the way, let's not get into a morass and FWIW, I have bought stuff from Ron before for my RS, so I have no doubts about the quality of gear he vends.