Considering the mods listed, it's got to be BHP, not RWHP. There were only a handfull of cars making over 400RWHP 4 years ago on stock turbos, and they all had more mods then stage III. A Stage III car would be over 400BPH, but not near 400RWHP.
Sorry Christa, that 400 number is BHP. Jim Wolf had to be telling you BHP, otherwise post a dyno chart of the car and we'll shut up about it... I just think you've misunderstood or were mislead.
Later
"Never underestimate the power of a wheelie." - Jesse James on Monster Garage's BTS show. Couldn't agree with him more... still waiting to see NiXit's Joop do a reverse wheelie.
When was the last time you *really* did something with your Z to call yourself a Z enthusiast?