Happy,
I have a 2000 GTS ACR with: 2.4 liter ROE (Keith Black SC), 1.7 ratio rockers, VEC II, water/**** (w/m) injection. The car came with 6.5 psi pulley and tuned on w/m. I went back to 5 psi and tuned on gas only. Now use the w/m to keep the intake charge cool only (not for performance gains, but for track day events). Car makes 520 WHP and 528 lb.ft.torque. Modest but reliable.
I will be forging the bottom end next year and will go to the 2.8liter ROE SC and other performance stuff (cam, lower comperssion ratio, head work, etc.). In the end I can go with 8-10 psi and really make the power. Will still ony tune on gas and use w/m to keep things cool. I am expecting between 750 and 850 WHP and tons of torque.
The ROE sounds awsome, espescially without cats. Now running all B&B exhaust parts (3").