Valvetronic Designs BMW G80/G82/G83 M3/M4 Valved Sport Cat-Back Exhaust System

Upgrade your BMW G8X M3 or M4 with the Valvetronic Designs Valved Sport Exhaust System, a complete cat-back system engineered specifically for the BMW S58 platform.

The system combines Valvetronic Designs' 3.5-inch equal-length mid-pipe with a valved axle-back exhaust, creating a complete exhaust solution designed to improve both exhaust flow and sound quality.

The equal-length mid-pipe is engineered to balance exhaust pulses and produce a smoother, higher-frequency exhaust note, while the valved axle-back provides control over the exhaust volume and character.

With the valves closed, the system is designed to provide a more refined and controlled driving experience. Open the valves and the exhaust takes on a significantly more aggressive and engaging character.

Key Features

• Genuine Valvetronic Designs performance exhaust
• Complete cat-back exhaust system
• Designed specifically for BMW G8X M3/M4
• BMW S58 3.0L twin-turbo engine
• 3.5-inch equal-length mid-pipe
• 2.75-inch axle-back section
• Electronic exhaust valves
• Includes valve controller
• OEM valve integration available
• Precision TIG-welded construction
• Fully mandrel-bent tubing
• Available in T304 stainless steel or Grade 5 titanium
• Designed to improve exhaust flow
• Designed to produce a smoother, higher-frequency exhaust tone
• Fully reversible
• Compatible with OEM downpipes
• Compatible with aftermarket/free-flow front pipes
• Professional installation recommended

Vehicle Fitment

BMW G80 M3

• 2020+
• G80 M3
• S58 engine

BMW G82 M4

• 2020+
• G82 M4 Coupe
• S58 engine

BMW G83 M4

• 2020+
• G83 M4 Convertible
• S58 engine

Equal-Length Mid-Pipe

At the heart of the system is Valvetronic Designs' single 3.5-inch equal-length mid-pipe.

The equal-length configuration is designed to balance exhaust pulses before they reach the rear exhaust system. This helps create a smoother and higher-frequency exhaust note while bringing out more of the S58's inline-six character.

The 3.5-inch mid-pipe is also designed to support increased exhaust flow and higher-horsepower applications, including hybrid-turbo setups.

Valved Axle-Back

The cat-back system incorporates a valved axle-back section with electronic exhaust valves.

The valve system gives the driver control over the exhaust character:

Valves Closed

• More controlled exhaust volume
• Refined sound for everyday driving
• Designed to minimize unwanted noise

Valves Open

• More aggressive exhaust note
• Increased exhaust presence
• Sportier and more engaging sound

The system includes a dedicated valve controller, while OEM valve integration is also available.

What Is Included

The complete cat-back configuration includes:

• Equal-length 3.5-inch mid-pipe assembly
• Valved axle-back exhaust system
• Electronic valve controller
• Exhaust tips
• Cross brace
• Required hardware
• Clamps

The exact tip and material configuration depends on the option selected at checkout.

Compatibility

The system is designed to work with:

• OEM BMW downpipes
• Aftermarket/free-flow front pipes
• BMW G80 M3
• BMW G82 M4
• BMW G83 M4

The system is also designed as a modular platform, allowing the mid-pipe and axle-back sections to be installed independently when desired.