Stromung can custom make anything, if you have the time and money...
I had them make myself and AaronB custom 2.5" piped dual tip mufflers last year, and this year when I upgraded to the new setup, I called them up (always talk with Scott) and told him what I wanted.... I basically got a WRX SS muffler, custom pipe from the axle back in 3", painted flat black like the mild steel one, with the hangers in the RS location.
I like it, it just seems to fit so perfectly. I've had 3 Stromung mufflers, never once have I had a problem with them... I know others have and really don't like Scott.....
AFAIK, I'm the only person with a 3" Stromung.....