The Stone Exhaust AP526B is a full stainless steel, UK-engineered cat-back for F22 and F23 M240i & M240i xDrive with the B58 engine. CNC-bent tubing, mechanical welding and factory valve integration mean it fits perfectly - no mods needed.
Retains OEM ECU control: quiet in Comfort, aggressive in Sport mode
Zero drone, daily-drivable tone, track-day ready when valves are open
2-year warranty, 3D-scanned for exact F22/F23 B58 fitment
