Ok.... This is a friendly challange..... I own and race corvettes... some with over 600HP, so I wont pick on the fastest production 4 door heavy car build with those, but apples to apples my 85 745I will give a good challange to your modified M5..... Hows 385Rear and 485 Torque on my 3500LB automatic, 26000 mile stock 745 with 12.5LBS of boost. 1/4 mile I have seen some m5's run a nice 12.90 at 112MPH here in dallas. I cant do a 12.90, but a 13.45 at 115... See what I'm getting at! Should be a good challange to any interested parties who want to go 0-160MPH...... Just make sure you have the chip that allows you not to shut down at 15?. If you ever have a shadow of a doubt about the older BMWs here is a chance to see what they can really do. I am in dallas, email me if you are interested.