The last time the Dinan name graced the pages of Autoblog, Michael Harley was waxing poetic about the S3-R BMW 1M Coupe, a car that still stands in his ranks as one of the best cars he's ever driven.

Dinan's newest iterations won't completely overwrite our recollection of the fantastic massaged and high-revving E39 M5 and E90 M3 V-8s ... and 668 pound-feet from BMW's twin-turbo 3.0-liter ...

Steve Dinan has been enhancing BMW models since 1979. But don't throw his company into the ring with the dozen or so other tuners who tweak, tinker and piggyback upgrades on the famed German marque.