I've been at stage 3 for almost a year now on a stock clutch and everything so far is fine. I don't do any drag race from a stop and only sometimes on the freeway. I think the clutch will last as long as there's no hard launches. I was on the freeway last month and punched it in 3rd-5th gear, the clutch slipped evertime it hit 5000 rpms. My brake master cylinder fluid level was very low when I checked and I hope that was the problem and not the clutch. I haven't taken the car past the 5000rpm mark ever since and it may be time for a stronger clutch.
