After owning my fair share of toyota's. I'm some what with RR here. Toyota's of today are soulless. The urge is slowly growing by the day to actually go look at one and see if I can convince myself out of my mk5?
I think I already know the answer, truth be told. Even at my golf approaching 7-8 years old. Still enjoy it far more then I ever could a mk6. (mk6 looks just don't do it for me, but the TSI engine is whole different ball game) I digress however.
So it comes down to going backwards to say mk4-mk2, keep mk5 or go new but then I would choose Toybaru or subyota. It will be one hell of a convincing act thou.
Over in the states there is a company called nameless performance. They have thus far managed 20-25HP increase by a mere CAT back system. They are still developing the Exhaust Manifold I believe. Scratch that, They are developing the subyota (fairly sure however the system would fit both I'm sure) Full system is available right now.
So even in NA variant, there are improvements. There are a few supercharger and turbo kit's already available for these cars. Funnily enough the BRZ is turbo route and the FRS/FT86 is more supercharger orientated.
It looks really nice from outside with wheels and suspension alone. But the interior Still has a lot to be desired.