The BMW G80 M3, G82 M4, G83 M4 Convertible and G87 M2 give enthusiasts an exciting foundation for a performance build. At the heart of these models is the S58 twin-turbocharged inline-six, an engine that responds with strong acceleration and a distinctive exhaust character.

For enthusiasts building a dedicated competition setup, the exhaust path immediately after the turbochargers is an important part of the overall configuration.

Our MAD BMW G8X S58 3.5-Inch Catless Hydroformed Downpipes combine an enlarged exhaust path with precisely formed tubing, 304 stainless steel construction and integrated flex sections. Designed specifically for the S58 platform, they offer increased exhaust flow capacity and a louder, more aggressive sound for applications where catless modifications are permitted.

A Larger Exhaust Path for Your S58 Build

Downpipes carry exhaust gases away from the turbochargers and into the rest of the exhaust system. Their diameter, internal geometry and catalytic configuration influence the restriction in that section of the exhaust path.

Our MAD downpipes feature a 3.5-inch design and a catless configuration, providing a less restrictive route immediately after the turbochargers.

For a modified S58 competition application, this makes them a purposeful addition to a build focused on exhaust flow. They provide a freer-flowing foundation without relying on a claimed horsepower figure that may not reflect your particular setup.

Actual performance results depend on the complete vehicle configuration, including its calibration, fuel and supporting modifications.

Hydroformed Construction: Precision Through the Bends

The defining feature of these downpipes is their hydroformed construction.

Hydroforming uses high-pressure fluid to shape metal into precise, complex forms. This process allows us to create smooth contours and carefully shaped transitions through the tubing, giving the downpipes geometry tailored to the S58 application.

That shaping matters in the tightly packaged G8X engine bay. A large-diameter exhaust component must follow a specific route while accommodating the surrounding components.

Our hydroformed design combines the enlarged exhaust path with smooth bends and a uniform shape. It is an approach that brings together flow capacity, structural integrity and packaging suited to the platform.

A More Aggressive Exhaust Note

Sound is a major part of the appeal of a modified S58, and these downpipes bring a more direct character to the exhaust.

Removing the factory catalytic elements allows for a louder, more aggressive exhaust note, with more pronounced turbo character under acceleration. For enthusiasts seeking a stronger sound from a competition build, this changes the experience well beyond the appearance of the parts themselves.

The final sound will depend on the rest of your exhaust system. Your midpipe, resonators, rear exhaust and valve configuration all contribute to the volume and tone.

Whether your build uses a relatively restrained rear section or a more extensive exhaust setup, these downpipes create a freer-flowing starting point directly after the turbochargers.

Made from 304 Stainless Steel

Our MAD S58 hydroformed downpipes are made from 304 stainless steel.

This construction complements the hydroformed geometry, providing a material suited to the demanding environment of an exhaust system. Combined with the large-diameter tubing and platform-specific shape, it creates a product designed around the needs of a modified S58 application.

For a component positioned close to the turbochargers, material selection and construction are central to the design.

Integrated Flex Sections

The downpipes also feature integrated flex sections.

These sections accommodate movement within the exhaust assembly, adding flexibility to a system that experiences engine movement and temperature changes during operation.

It is a practical detail that complements the precisely formed tubing and helps make these downpipes a complete upgrade for the intended application.

Compatible with Left-Hand Drive and Right-Hand Drive Vehicles

Our MAD 3.5-inch catless hydroformed downpipes are designed for both left-hand drive and right-hand drive vehicles within the listed applications.

This gives S58 enthusiasts across different markets access to the same hydroformed construction, enlarged exhaust path and integrated flex sections.

Confirm your specific vehicle against the fitment list before ordering.

Key Features

• 3.5-inch diameter for increased exhaust flow capacity.
• Hydroformed tubing with precise shaping and smooth transitions.
• Catless configuration designed to reduce exhaust restriction.
• 304 stainless steel construction.
• Designed specifically for the BMW S58 engine platform.
• Compatible with left-hand drive and right-hand drive vehicles.
• Integrated flex sections.
• A louder, more aggressive exhaust note with enhanced turbo character.

BMW Fitment

Our MAD BMW G8X S58 3.5-Inch Catless Hydroformed Downpipes are designed for:

• BMW G80 M3 — 2021 and newer
• BMW G82 M4 Coupe — 2021 and newer
• BMW G83 M4 Convertible — 2021 and newer
• BMW G87 M2 — 2023 and newer

From the G80 M3 sedan to the compact G87 M2, these downpipes bring the same combination of hydroformed construction and increased exhaust flow capacity to the listed S58-powered models.

Installation: Required Gaskets

Downpipe gaskets are not included.

Installation requires two gaskets, part number 18308053348. Plan to have these available before beginning the installation so the required components are ready alongside your downpipes.

Intended for Off-Road and Competition Use

These downpipes are not legal for sale or use on pollution-controlled vehicles operated on public roads, highways or streets. They are intended for off-road, race or closed-course competition use only, where such modifications are permitted.

Purchasers are responsible for complying with all applicable emissions laws and regulations. MAD and its affiliates disclaim liability for improper or unlawful use. Public-road use may violate the Federal Clean Air Act and similar state laws.

Please check the laws applicable to your location and intended use before purchasing or installing this product.

Build Your S58 Exhaust Around MAD

A well-planned competition build starts with components selected for a clear purpose.

Our MAD 3.5-Inch Catless Hydroformed Downpipes give BMW S58 enthusiasts an enlarged exhaust path, smooth hydroformed geometry, 304 stainless steel construction and integrated flex sections in one platform-specific upgrade.

If you are looking to reduce exhaust restriction and bring out a more aggressive side of your G80 M3, G82/G83 M4 or G87 M2 competition setup, explore the details and fitment below.

Shop MAD BMW S58 G80/G82/G83/G87 M3, M4 and M2 3.5-Inch Catless Hydroformed Downpipes