ARM Motorsports S58 MIDPIPES - G80 M3 G82/G83 M4

The ARM Motorsports S58 Midpipes are engineered to transform the exhaust character of your G80 M3 or G82/G83 M4. By removing the factory secondary catalysts and the two large resonators, these midpipes dramatically increase exhaust volume while enhancing the clarity, richness, and exotic tone of the S58 engine. With the OEM muffler retained, you maintain full valve control—allowing quiet operation when needed and maximum sound when the valves open.

Available in either X-Pipe or H-Pipe configuration, these midpipes merge exhaust pulses from both banks of the S58 to create a more refined and aggressive note. The X-Pipe produces a sharper, higher-pitched exotic tone, while the H-Pipe delivers a deeper, more classic performance sound. Both options sit securely above the OEM underbody brace with proper clearance, requiring no additional bracing or trimming.

Constructed from mandrel-bent SS304 stainless steel, the system runs a full 3 inches from the downpipe connection before transitioning to 2.75 inches at the OEM muffler junction for a perfect factory-style fit. The midpipes use OEM-style 2-bolt flanges for compatibility with stock or aftermarket downpipes and mount securely using factory-style hanger points for stable performance even under aggressive driving.

Optional upgrades include the ARM S58 Crossover Pipe for an additional 4 lb weight reduction and increased sound output, as well as Axle-Back Adapters designed to mate the midpipe to most aftermarket 70 mm axle-back systems.

Fitment:

Compatible with OEM center-exit exhaust.

• BMW G80 M3 (3.0L S58)
• BMW G80 M3 Competition xDrive (3.0L S58)
• BMW G82 M4 (3.0L S58)
• BMW G82 M4 Competition xDrive (3.0L S58)
• BMW G83 M4 (3.0L S58)
• BMW G83 M4 Competition xDrive (3.0L S58)