Killer Bee™ MF103 Cold Air Induction is Halltech's high performance induction system requiring no tuning, no codes, no cutting, no water ingestion issues,which means you are warranty safe. It comes with the Beehive™ heat shield, which in itself conserves horsepower and torque by isolating the air filter and MAF sensor from the incredibly hot engine bay heat. Halltech's MF103 features our MAF forward (MF) design for perfect idle quality and MAF translation. We recommend NO HOLES under our filter. You will never get codes of any kind from our intake system. The Halltech Killer Bee™ MF103 is our plug an play 20 HP unit, measures 103 to 104mm at the MAF cross section, and is engineered to translate the MAF tables exactly like stock, eliminating tuning or closed loop MAF tuning. It is for the tuner type Speed Shop only.