Enhance Your BMW M3/M4 with Remus G80 G82 Cat Replacement Tube

by Dan May 16, 2026

Upgrade Your BMW M3 or M4 with the Remus BMW G80 G82 Racing Secondary-Cat-Replacement Tube

For BMW enthusiasts seeking more performance, sound, and racing-focused efficiency, the Remus BMW G80 G82 Racing Secondary-Cat-replacement Tube (M3, M3 Competition, M4 & M4 Competition) is one of the most impactful exhaust upgrades available. Designed specifically for the 2021+ BMW G80 M3 and G82 M4 platforms, this secondary-cat-delete system enhances exhaust flow, sharpens throttle response, and unleashes a far more aggressive exhaust tone—all while maintaining the premium engineering quality Remus is known for.

This blog will break down what the secondary-cat-replacement tube is, what it does, why it matters, and how it benefits performance-driven BMW owners.

What Is a Secondary-Cat-Replacement Tube?

The Remus BMW G80 G82 Racing Secondary-Cat-replacement Tube replaces the factory secondary catalytic converters located in the mid-pipe section of the exhaust system. These factory components restrict exhaust flow, reduce sound, and create back pressure that limits performance potential.

By installing this racing-focused pipe, you remove that restriction and create a more direct, free-flowing exhaust path. The result is a louder and more aggressive exhaust note, increased engine efficiency, and a noticeable improvement in responsiveness.

This upgrade is designed exclusively for racing or track use—an important detail highlighted by Remus. The part has no ECE approval and requires cutting the factory exhaust for installation.

Why the Remus Racing Secondary-Cat-Replacement Tube Makes a Difference

Remus is known globally for engineering high-performance exhaust technologies, and this component is no exception. Compared to the factory pipe diameter of 70 mm, the Remus tube expands to 76 mm, providing a significant increase in exhaust flow capacity.

The benefits of this upgrade include:

A more aggressive, motorsport-inspired exhaust tone
Reduced back pressure for improved engine efficiency
Potential performance gains when paired with ECU remapping
A lightweight, higher-quality stainless steel construction
Enhanced durability and precision fitment thanks to Austrian hand craftsmanship

For drivers looking to bring out the full character of the S58 engine in the G80/G82 platform, this modification makes an immediate and dramatic difference.

Key Features of the Remus G80 G82 Racing Secondary-Cat-Replacement Tube

Remus didn’t simply increase pipe diameter; they engineered this system to offer long-term durability and superior performance. Key features include:

Aggressive racing sound profile
Shot-blasted, 100% stainless steel surface for improved durability
Lightweight construction optimized for motorsport
Handmade craftsmanship in Austria
Perfect shape and fitment for BMW G80 and G82 models
24-month Remus warranty (non-transferable)

These qualities make it a high-quality, dependable choice for track enthusiasts and performance-focused drivers.

Real-World Benefits for BMW M3 and M4 Owners

Installing the Remus BMW G80 G82 Racing Secondary-Cat-replacement Tube brings real advantages, especially for drivers who regularly push their cars on closed tracks or private roads.

More aggressive and satisfying exhaust sound: The S58 engine produces an incredible tone when less restricted. Removing the secondary cats allows the exhaust system to breathe and resonate more freely.
Enhanced throttle response: With reduced back pressure, the engine can rev more cleanly and with less strain.
Optimized performance when tuned: Remus notes that pairing the system with ECU remapping maximizes performance potential while preventing unnecessary check-engine alerts.
Weight reduction: Lightweight stainless steel construction sheds unnecessary mass from the vehicle.
Improved exhaust flow for track driving: For those who take their M3 or M4 to track days, this upgrade helps maintain engine performance consistency under high load.

Many owners describe this upgrade as one of the most transformative changes they make to their G80 M3 or G82 M4, both in terms of sound quality and driving feel.

Compatibility with BMW G80 and G82 Models

The Remus BMW G80 G82 Racing Secondary-Cat-replacement Tube is compatible with:

BMW G80 M3 (2021+) with or without GPF
BMW G80 M3 Competition (2021+) with or without GPF
BMW G82 M4 (2021+) with or without GPF
BMW G82 M4 Competition (2021+) with or without GPF

The part number for this component is 081021 1100. Before shipment, many retailers—including the one offering this part—can perform a compatibility check using your license plate (UK) or VIN for added confidence.

Important Notes About Installation and Use

Because this is a racing component designed for closed-course use, there are several important considerations:

The original exhaust system must be cut for installation.
The product has no ECE approval.
Use on public roads may not be permitted in many regions.
An ECU remap is recommended to prevent warning lights and optimize performance.

These details ensure drivers understand the racing-specific nature of the product and can make informed decisions based on their intended use.

Is the Remus Racing Secondary-Cat-Replacement Tube Worth It?

For BMW M3 and M4 owners who want a louder, more dramatic exhaust note and improved performance on track, the Remus BMW G80 G82 Racing Secondary-Cat-replacement Tube is an excellent upgrade. It combines premium craftsmanship, noticeable performance benefits, and the unmistakable racing sound that many M owners seek.

If your goal is to unlock more character from your S58-powered BMW and enjoy a more engaging driving experience, this Remus system is a strong contender among performance exhaust modifications.