The first time I had my car tuned and dyno'ed at SpecialtyZ, I had G3 intakes, Berk HFCs, a Tanabe Y pipe, and Seb's tune. I ended up putting down 309whp and 259ftlbs of torque, which is right inline with what the average of other 370Zs with similar mods run on that dyno. You should be hitting right around 300whp assuming a decent correction factor. Oh, and Seb is the man! You will love your tune