With R4-S's on my "Stage 2" WRX (~210 WHP) and new ATE fluid, I got some noticeable fade at RFR. They aren't track pads.
The next SCCA event at RFR is Jul 22-23.
http://www.renoscca.com/events/2006/...20Schedule.htm
But maybe check the "Calendar" link at the top of the page too.