KYOSTAR Valved Sport Catback Exhaust System for 2012-2015 BMW F30 F31 320i 328i N20 2.0T The KYOSTAR Valved Sport Catback Exhaust System is designed for BMW F30/F31 320i and 328i models equipped with the N20 2.0T Turbo engine. This complete exhaust upgrade improves exhaust flow efficiency, reduces factory exhaust restriction, and enhances turbocharged exhaust performance while providing adjustable sport exhaust sound control through an integrated valve system. Manufactured