@wdimagineer - Great list of mods. I think you'd be the Euro equivalent of a JDM (Japanese Domestic Market) fiend!
Did the Seibon rear diffuser not work out? Some of the Seibon products look similar to the Manhart products for reasons let's not go in to
but is the fitment spot on compared to the Seibon piece? I'd prefer to hear opinions from an actual owner and not a vendor.
It's a shame that the Eisenmann didn't work out as far as sound levels. Though people bash the Akrapovic I still think for me personally it's the way I'm going to go.
The M6 wheel doesn't fit my style taste as I personally think it matches the M6's styling better but to each his own. It can be a M5/6 cross-breed.
Happy tuning!