I randomly stumbled across this Estoril over Estoril/Black M Coupe owned by Z3M-Johan of Sweden. I noticed his user name after linking to his profile from an article about his home audio setup. Some great pics of his M Coupe, which appears to be an S50 based upon the flat badges and non-chrome ringed headlights. I’ve searched for any additional details on the car or the owner, but it’s tough to find anything since everything written by him is in Swedish.
His in car audio is pretty impressive looking. The install includes a Pioneer P9 head unit, Genesis 5 channel amp mounted in a glass covered trunk floor enclosure vented by two fans. He modified the stock Harman Kardon subwoofer enclosure to accept a JL 6″ sub, wrapped the entire box in fiberglass, then smoothed and painted the enclosure. While I’m sure the additional material around the sub enclosure increases the weight, it probably improves the bass response dramatically.