Mine slipped on the dyno at exactly 300lbft. 80K miles old. I had to stick a Helix kit in to hold stage 1, let alone stage 2/2+ !!
The OEM clutch is only rated to 280ish lbft, so remaps will kill them off pretty quickly, especially if half worn or more.
Where you will notice it the most on the road is giving it the beans up a hill in 4th, around 3000rpm. If the revs rise sharply but the car doesn't accelerate.....new clutch time.
Get the Helix kit with the recent billet cover from AKS Tuning. DO NOT get a Sachs sporting kit, or an early Helix kit that uses the Sachs sporting cover plate. They are bloody awful.