Currently there no program available that I know of that will allow correct dyno of M5. I am currently checking with BMW Sartanburg to see if they have any ideas. "Butt Dyno" says the Cold Air intake was the the trick. Started with the Exhaust. Had better sound but not much response difference on throttle. Added Cold Air intake and it's spin city! This is going to ruin my tire budget! Torque is almost instant. Throttle response at all speeds is even more amazing than before. I'm now truly scared of my own vehicle. It's like some monster sitting out in the garage waiting to attack some poor unsuspecting Porsche. It may not beat the new 911 Turbo but it'll scare the hell out of the rest of them! Mark