Description
The ARM Motorsport S58 4.5" Single Midpipe is engineered to transform the exhaust note of your BMW G80 M3 / G82 G83 M4, delivering a deeper, more aggressive sound. By eliminating the secondary catalytic converters and dual mid-section resonators, this upgrade maximizes the raw sound of the S58 3.0L twin-turbocharged engine while maintaining full control over your OEM exhaust valves. Whether you want an exhilarating, motorsport-inspired tone or a quieter ride with the valves closed, this midpipe offers the ultimate balance of performance and versatility.
Unleash the True Sound of Your S58 Engine
Upgrading to the ARM S58 4.5" Midpipe not only enhances exhaust volume but also refines the acoustics, creating a more pronounced, exotic exhaust note. The midpipe accentuates the signature S58 burbles, even with stock tuning. For an even louder and more aggressive tone, pair it with ARM S58 Downpipes to further increase exhaust flow and volume.
Precision Engineering & Durable Construction
Crafted from high-grade SS304 stainless steel, the ARM S58 Midpipe is designed to withstand extreme heat and rigorous driving conditions. It features a 4.5" mandrel-bent construction, optimizing airflow from the downpipes to the rear section.
- OEM-Compatible Fitment – Directly connects to stock or aftermarket downpipes designed for OEM exhaust systems.
- Seamless Integration – Reduces to 2.75" at the rear for a perfect fit with the OEM muffler section.
- Slip-Fit Connection – Ensures a secure, leak-free fit while simplifying installation.
- Enhanced Sound Tuning – The 4.5" single midpipe merge refines the exhaust note by blending sound waves from both engine banks.
- OEM Exhaust Valve Compatibility – Retains full control over the stock exhaust valves for adjustable sound levels.
- Lightweight Performance – Weighs 15 lbs less than the stock midpipe, reducing overall vehicle weight.
Secure Fitment & Compatibility with Aftermarket Systems
The ARM S58 4.5" Single Midpipe mounts securely using an OEM-style passenger-side bracket, ensuring stability under high-performance driving conditions. Additionally, Axle Back Adapters allow seamless integration with most aftermarket axle-back exhaust systems, which typically reduce from 3" (76mm) to 2.75" (70mm).
What’s Included?
- 2x ARM Downpipe Gaskets
- 1x ARM Extended Brace
- 2x Front 4.5" Midpipe Sections
- 2x Rear Exhaust Sections
- 5x ARM Clamps
Fitment:
- BMW G80 M3 – S58 3.0L
- BMW G80 M3 Competition xDrive – S58 3.0L
- BMW G82 M4 – S58 3.0L
- BMW G82 M4 Competition xDrive – S58 3.0L
- BMW G83 M4 – S58 3.0L
- BMW G83 M4 Competition xDrive – S58 3.0L
ARM Motorsport Lifetime Warranty
Every ARM Motorsport product is backed by a lifetime warranty, ensuring protection against craftsmanship defects and fitment issues.
Note: This product is intended for off-road use only and may not be legal for public road use in certain states and provinces. It is designed for racing applications and vehicles that may never be operated on public roads.
