Hi there. As I just posted on the 'Introduce yourself' topic, I recently had a s/steel quad rear section fitted by Stainless Exhaust Specialists in Sutton-in-Ashfield. The guys on the Z4 Forum who had this done were full of praise for the job these guys did and I can see why now. Awesome! Having had a s/s system fitted by a national chain to an XK8 convertible (before I saw the light), I was a little nervous, as the boom in the cabin at 80 was awful. No such problem with this. Superb work and the tone is just a tad more grown up than the OEM system. Coupled with the upgraded rear lights to quad spots, I love the symmetry this delivers.