German tuning companies have been mapping them since October but have been restricted by the clutches. They've been slipping at 490NM ish so they've been restricting maps to 480Nm for safety.
It will be a combination of the friction disc and pressure plate, but it doesn't go bang, just slips.
I remember the Vectra VXRs had a similar thing with remaps and slipping clutches. It used to crack their flywheels and they got wise to it very quickly and soon stopped replacing them on warranty turning it into a £2k job to get the clutch and flywheel replaced on them.
It will be the same clutch on the 9G and 10G cars too as they'll have the same engine and drive train. Something will come to market soon, but customers are going to learn the hard way if they start down this road without uprated clutches.