These fiberglass ducts fit inside the air scoops behind the doors on all 818 models.  They are designed to work with flexible air ducting 4 inches in diameter to duct air toward the intercooler, intake inlet, or rear brakes.

Note: The ducts must be bonded or glassed in place from the backside but can be installed on an already painted body.  They ship in black gel-coat and can be painted to match body color or used as is.