Replaces OEM charge pipe to allows more air to flow into intake chamber. Performance gains unknown, but did achieve higher average highway MPGs (18-19) for 2009 DCT M3. Usage ~5k miles.
Asking $300 for the charge pipe only. Shipping included to anywhere in the US.
Also have some AFE Ram Air Intake Scoops. These do not require any drilling of the front bumper for install, only patience removing/installing front grill. PM for price if interested. (SOLD)