BMW 4 F33 Midpipes & X-Pipes

When it comes to exhaust upgrades on the BMW F33 (the 4 Series convertible), the platform shares its underpinnings with the F30/F32, so enthusiasts benefit from a wide range of proven aftermarket options. For the turbocharged N20 and N55 engines commonly found in the 428i and 435i respectively, catback systems from Remus, Akrapovič, and Eisenmann are among the most respected choices, delivering a more aggressive exhaust note without sacrificing daily drivability. Milltek Sport offers a particularly popular non-resonated catback for those wanting a louder, more characterful tone, while their resonated version suits drivers who prefer a subtler upgrade. Downpipe replacements, such as those from Berk Technology or Turner Motorsport, can unlock meaningful power gains on the N55, especially when paired with an ECU tune. Valve-controlled exhaust systems, like those from AWE Tuning, give F33 owners flexibility between a quiet cruising mode and an open, sporty soundtrack at the push of a button. Before purchasing, always confirm fitment against your specific build date and engine code, as early and late production F33s can have minor differences in exhaust routing that affect direct bolt-on compatibility.