I saw Spartn27 posted this in another thread 'Carbon Fiber' and thought I would put his quote here: "It wasn't cost effective to manufacture and have them all handmade at the quality I would like to put my name on. Also after testing many setups I highly recommend just modifying the OEM cat + resonator by deleting them and replacing them with a free flowing aftermarket resonator. The stock mufflers do a great job at killing drone."
If your like me, I sometimes read a thread and can never find it again. Hope this helps you future modders.....