A standard clutch should easily be able to handle a stage one map! As for the designers of them, they surely wouldn't use a clutch that was rated to just above a standard cars output figures as that would mean a crappy lifespan on a standard car. There are enough stage 2+ cars that run no problem. Mine been one. I did a track day and full day drag strip all on standard clutch stage 2+ and no problems at 50k