911 Upgrade Help

I have a 992.1 S and struggling to find a garage who can help with some basic factory upgrades.

Looking for the standard Sports exhaust that Porsche offers/offered as an upgrade when speccing the car. Most of them you see on the street have the Sports exhaust (the two big round ones rather than the small quad round exhausts), mine unfortunately doesn’t. I’m just looking for the original Porsche part from somewhere so I can hopefully also sell my own original ones on.

Trying to explain this to a garage seems incomprehensible for some reason even when Googling those that deal only in original Porsche parts - I have tried like 4-5 already. I also know that Porsche basically would charge double to do this after speccing the car. Anyone have any recommendations for garages that can do this?

The other part I’d want to upgrade is the sound system as I have the Bose and would like the Burmester though not sure how possible that upgrade is with the location of the subs etc.

Thanks!