Damned good answer, Jerry. VW knew about it, the bus muffler differed from the beetle muffler in that it (bus) only had one outlet, instead of 2, with the same sized outlet, and a different tailpipe to avoid damage. This was a good muffler to put on a stock beetle in mountain country. BMW's have always seemed to run better with the stock exhaust system, than any aftermarket, those engineers know what they are doing. I have seen lots of CJs running headers, big tubes, and flowmaster mufflers. The 4 and 6 cyl engines sound even sillier than an 8 with this setup, and are LESS functional for most off-road use. People just don't seem to understand that louder doesn't make it better. When we stopped using megaphones on racing buggies and used small corvair "turbo-mufflers" to comply with those pesky racing rules, we found that the cars ran better, the ride was more pleasant, and we could see more wildlife, before it got scared off.