dB killer for 999/749 exhaust

Hi all. Contemplating a 749 for trackday fun (to join the ‘string’). It has a 54mm (or poss 57mm) system fitted but I was wondering whether this would give me grief with noise testing. Machine is in ‘project’ state so needs some work. I’ve seen dB killers for 916-style exhausts and they look straightforward to fit - but what about 999s and 749s?