I found these on amazon and ebay:
Borla 40842S S-type Muffler
https://www.amazon.com/gp/product/B0...KIKX0DER&psc=1
It's got good reviews and says its a universal fit.
Has anyone tried these on the 6th gen? It is considerably less expensive than buying the entire Borla S-type axle back exhaust system.