KYOSTAR Valved Sport Catback Exhaust System for 2019-2025 BMW G20 G21 M340i G22 G23 M440i B58 3.0T The KYOSTAR Valved Sport Catback Exhaust System is designed for BMW G20/G21 M340i and G22/G23 M440i models equipped with the B58 3.0T Twin Turbo engine. This complete catback exhaust upgrade improves exhaust flow efficiency, reduces exhaust restriction, and enhances the turbocharged exhaust character while maintaining adjustable sound control through an integrated valve system.
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