I got mine tuned by jf automotive in Maidstone as its down the road from me and they tuned my gt86 when I had it.
The graph they gave me shows its pushing 331 bhp and 561nm of torque (I would post it but I still can't post pictures 🙃
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Well after seeing that my future car won't be a focus RS 😂.
I was kinda hoping someone might have done something but could be interesting being one of the first 😂.
There seems to be alot of tuning options and parts available to the American Market but less so to the English market which is annoying but there are still coilovers, brakes, induction kits available here for a premium though.