It was a friends car first, he had 19T installed and it was great. Then another friend kept asking me for my 19T to install into his R26...it was too good offer to refuse so I sold him 19T and bought 20T.
Now the car has 348bhp od 378bhp depending on the dyno. IMHO, that's borderline power for track days, but if you use it for a straight line racing/street racing then it's never enough.
IMHO, the best(buy) setup is Stage 2 with 310-330bhp, in the meantime invest in the suspension, brakes, tires and of course - in yourself.