Originally Posted by 4 R1NGS
Supersprint is UK based. Maybe it's not Euro vs US but UK vs US which might mean LHD vs RHD?
Just a guess.
I know I'm replying to a 6+ month old post, but Supersprint is based in Italy (between Milan and Venice), so they are likely catering more toward LHD vehicles- at least LHD would be more prevalent in the vehicles available for exhaust development and test mules.
The other aspect of this I had not thought of until seeing Iconoclast's aftermarket setup is that the rear suitcase muffler on a Q7 does provide some "cosmetic" function (not saying his is ugly, just that you notice the difference from lower rear valance view). That may account to some degree why many aftermarket exhaust makers don't go after the Q7. To finish off the rear muffler section in a similar cosmetic fashion (like the stock unit) is probably cost prohibitive on an already limited market where, as has already been noted, most new Q7 buyers aren't looking to mod.