I don't know, but I think you may find that just a catalytic converter may get the noise level to your liking. Probably easiest way to get one is a post on the private for sale area of TDI club.
I'm running a generic catalytic converter for a 1 ton diesel pickup on my car, along with the cat back for a 1.8T. I used to think it was really quiet, but now that I EV it seems kind of loud, but no worse than a Prius (with ICE running).
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2016 Tesla Model X
2022 Sprinter
Gone 2012 Tesla Model S P85
Gone 2013 Nissan LEAF SV
2012 Nissan LEAF SV
6 speed ALH TDI Swapped in to a 2003 Jetta Wagon
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