F22 F23 BMW M235i N55 valved cat-back exhaust AP504B

Direct-fit valved cat-back for F22 and F23 M235i models with the N55 engine. No coding, no modules - factory valve control works straight out of the box.

• OEM-integrated valve operation - closed valve = refined daily driver tone; open valve = deep, motorsport-inspired bark
• Drone-free design - engineered for real-world use, not just peak noise on a dyno
• One-piece construction - fewer joints, better flow, improved long-term reliability
• 7-axis CNC bent tubing - maintains near-perfect roundness for consistent gas flow
• In-house dyno validated - sound and flow tuned on actual N55 M235i chassis