[JST]

Originally Posted by Nick M3

A lot of the stock sound came from the US headers with the cats plugging them up. The Euro exhaust was much less of a chainsaw-in-a-blender.

Certain mufflers also didn't work at all. Borla has a peculiar tone that sounds absolutely awful on an S54 with headers. (You might remember the TMS Grand Am cars. Just awful.)

I'm running a pair of Dynomax Super Turbo mufflers on this exhaust. They're kind of a "least bad" choice of what's out there. They flow weirdly well for what they are (according to tests, better than many straight through mufflers), and actually provide something approaching an adequate level of sound deadening. The downside is that they refuse to make a stainless version, which is infuriating. In the real world, for the kind of use that my cars see, that's not a major issue, mind you.

The catalytic converters are E90 M3 secondary cats. I love these things because they work really well, are very high flow, are very tough, and because people cut them out of M3 exhausts, you can pick them up cheap if you're patient. I'm running them on my E36 as well now.

Unfortunately, in a perfect world, I would have liked to run a center muffler behind the cats. I just couldn't find the space to do it in a way that would make sense. So... This is going to be loud. Hopefully not insane. If it's really insane, I may have to accept a ground clearance penalty and put a small x-pipe muffler where the current X is.

Oh yeah? Deride the Fox bodies all you want, but 30 years ago the Walker Dynomax was the hot ticket in the Mustang world, IIRC. So at least you're period-correct?