Thee most amazing sounding E39 M5...

[fid]

...I've ever heard, driving through Taunton a couple of weeks back. Reg. was M5 XXA, and the beast was seriously loud. At idle - loud, pulling away - loud, full-bore pull away at traffic lights - LOUD! Quad exhaust, although, looked a larger diameter than standard...infact, there's no way it was standard...but it did sound stunning

[belleair302]

Either a Tubi or Hayward & Scott system.

[rassi]

Or an Eisenmann

[fid]

The clip on the Tubistyle website sounded a bit limp in comparison...closest I've heard is this Eisenmann race system on a 645i: http://video.google.com/videoplay?docid=-610027390...

...but again, louder, quite possibly de-catted - I want!