Rattle off sports exhaust valve

Has anyone found a cure for this as my car has only done 19000 miles.
This really drives me mad .
Apparently this is a common fault as the valve has wear on it.
Only just had the over heating problem sorted by Porsche after 3 attempts.
Also As I’m on here do I have to use Porsche disc breaks to keep my extended warranty as mine have worn down according to my last health check.