KYOSTAR Valved Sport Catback Exhaust System for BMW F30 F31 320i 330i B48 2.0T Turbo Engine The KYOSTAR Valved Sport Catback Exhaust System is designed for BMW F30 and F31 320i/330i models equipped with the B48 2.0T turbocharged engine. This complete exhaust upgrade improves exhaust flow efficiency, reduces factory exhaust restriction, and enhances turbocharged engine response while providing adjustable exhaust sound control through an integrated valve system. Manufactured