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I got 394 rwhp at 15 psi on 91 octane. Dyno conditions were not ideal as it was 85 degrees and the dyno operator could not read the correct RPMs the first 6 WOT runs. He got it right the 7th time so I'm sure my IAT's were through the roof. The haltech retards the timing and makes it rich (AFRs were in the mid 10s) when IAT get hot, so I'm sure I could have hit 415 - 425ish rwhp if I let the car cool down for an hour or so.
The next mods for the car come winter time are GSC S1 269 cams, fuel system with 1000cc injectors, swap my walbro fuel pump for a denso Supra TT pump, and turn it up to 20 psi on 91 octane. I'll add a meth system a few months later.
I dynoed 461 rwhp on 91 octane about 3 months ago, but maxed out the stock fuel system. So it's back at the shop getting an rmr fuel rail, ID 1000s, and Haltech Platinum Sport 2000 installed. We're gonna throw in 101 octane and turn it up to 23 psi and see what she can do.