I have OS Str twin plate clutch in my street car and it holds over 600rwhp and its a daily driver, bit rough but drivable. Have the standard OS twin plate in my race car and it holds 550rwhp no prob with slicks. I think OS recommend the triple plate over 700ps (roughly 700hp) but I doubt you will have problems. Just be prepared for hard pedal for stand OS, soft pedal for OS STR, rattle with both types, but still driveable. Had the ORC twinplate in my street car first and this held really well (up to 700ps) but was too on/off and heavy.