Originally Posted by ward
I'm sure intakes and exhaust are all pretty close, plus the frog's right about the computer adapting itself a bit
This is the most significant finding (other than dyno results) that favors the GruppeM design:
The opening toward the bottom brake duct area means that if the driver's side bottom grille were opened, cold air would get to the K&N air filter. As for the throttle body, forget for a moment that it's a "Dinan." It's a stock BMW throttle body that has been bored out a little bigger with a bigger valve. Dinan's claims are a mere +5 hp max and +4 ft-lbs torque, and I am assuming this is at the wheel.