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.

What if we told you Steve Dinan's latest BMW is (almost) a Porsche GT3 RS (minus ... The M3 Comp runs the quarter mile in 11.1 at 124.7 mph. The CarBahned version? 11.0 seconds at 126.1 mph.

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.

Use precise geolocation data and actively scan device characteristics for identification. This is done to store and access ...