We've had a number of VF34 ($900), FMIC ($1050), JDM Pink injectors ($430), Ecutek ($850) cars go over 300 whp. That's with my "100,000 mile" tune of 20 psi peak, 16 psi at 6k rpm and 14.5 psi at 7k rpm.
Generally they are near 300 wlb-ft and just over 300whp. Or add meth to that setup and get 330 wlb-ft and 320+ whp EVERY day. The meth would make it more consistent, but with an ej20, possibly shorten the ring life.
SS