R33 with GT3076 TS ATP housing HKS cast manifold etc, topped out at 290rwkw. I am not sure if the turbine housing is maxed or the wastegate is unable to hold itself shut or an exhaust restriction but it makes plenty of power for my needs so I am not that interested in chasing the last few kw's.
With some boost screwed in there this is the sort of number (excluding some extra slushbox losses) your setup will knock out if/when you lean on it.