Anri, I've got one as well but no M. I finished up all the mechanics all suspension, engine, tranny, diff, h&r race springs, and a z3 short shifter with a new clutch/pressure plate, slave cyl, master slave cyl, pretty much anything you can imagine has been replaced. Soon I'll be getting a full respray with the M tech side skirts and rear bumper. I purchased the last M tech spoiler for the 6er from Germany got smiley headlights, new tailights, new dash, cluster, got a stereo system waiting to go in with new speakers, I've been doing everything to it. Oh and picked up an e30 M3 got evo cloth custom done inside. You'll see at SoCal Vintage meet.
The motor started out as a 3.8 liter Dinan stroker that had about 100 K mi on it. I had it dyno'd at about 330 crank HP (from 287 HP stock). It was using oil so I needed it rebuilt. When I went to Dinan Engineering I was shocked to find they refused to rebuild my motor, even though they built the original. In case you don't know much about the Dinan motor, they took the original M88 Euro 3.5 liter motor and bored it to 3.8 Liter in combination with a custom built crank and custom pistons. It also used a special EEPROM in the ECU. One of the main reasons Dynan refused to rebuild had to do with the custom pistons, which were too expensive to procure, esp in + sizes needed for a bore honing or repair. It was designed for a 9.5 CR so it could use pump gas without detonation problems.Wow, especialy the engine.
More torque than the S62!
May ask more info how the engine is built ,also maybe a torque/hp dyno curve so i can drool