I think you guys are talking about the E30. Awesome car and my good friend has a turbo'd one (non-M3) which puts out ~ 450-500 hp. Pretty unsuspicious with stock 14's on it lol. I also have an E36 with M-suspension that will get a turbo soon. I have to agree that the E36 is a better blend of luxury and performance.
I have an E34 as well, but might get rid of it for an E39 M5. THAT is a true stock sleeper if you ask me. Understated looks, 5.0l V8 400 hp from ten years ago, and they can hold their own on the track too. Wiz, if you really do like sleepers, I think I've got one of the ultimates... I've got an oldschool Audi rocket couch with huge turbo on it, kind like the old group B engines but with more output and dry sump. Goal for this season is 850 all wheel hp and 11k RPM. Glad to see the Wizard can appreciate cars as well!
Back on topic, I'm looking forward to seeing what Heir has to offer in the coming months