Remus BMW G80/G82 Racing Secondary-Cat Tube: Boost Your M3/M4 Performance

by Dan May 15, 2026

Introduction to the Remus BMW G80 G82 Racing Secondary-Cat-replacement Tube

The Remus BMW G80 G82 Racing Secondary-Cat-replacement Tube (M3, M3 Competition, M4 & M4 Competition) is a premium performance upgrade engineered for BMW enthusiasts seeking a more aggressive exhaust sound, reduced back pressure, and enhanced driving dynamics. Designed specifically for the latest BMW M3 and M4 platforms, this racing-focused component replaces the factory secondary catalytic converters to unlock the true character of the S58 engine. As with all Remus products, it delivers exceptional craftsmanship, high-grade materials, and a race-ready design.

What This Racing Secondary-Cat-replacement Tube Does

The purpose of the Remus Racing Secondary-Cat-replacement Tube is to remove the restrictive factory secondary catalytic converters and replace them with free-flow stainless-steel piping. By eliminating these restrictions, exhaust gases can exit more efficiently, which results in improved performance and a deeper, more aggressive exhaust note. While the primary catalytic converters remain in place, this component is designed solely for closed-track and motorsport environments due to its racing-only configuration.

With the Remus tube, the original exhaust system must be cut for installation—a standard requirement for many high-performance exhaust upgrades. The result is a clean, precise fitment engineered to integrate seamlessly with OEM and aftermarket systems.

Why Enthusiasts Choose the Remus Racing Secondary-Cat-replacement Tube

This part is highly valued by performance-focused BMW owners for several reasons. Beyond simple sound enhancement, it delivers measurable improvements in flow efficiency and responsiveness. Remus, known globally for premium exhaust systems, builds each unit by hand in Austria using 100% stainless steel and shot-blasted finishing for strength and durability.

Noticeably more aggressive exhaust sound ideal for track use.
Lower back pressure improves engine breathing and responsiveness.
Lightweight construction helps optimize vehicle performance.
Perfect fitment designed specifically for the G80 and G82 chassis.
Manufactured with premium materials for long-term durability.
Supported by a 24-month Remus warranty.

Performance Benefits for BMW M3 and M4 Owners

The S58 engine in the BMW G80 M3 and G82 M4 is known for its incredible tunability and performance potential. The Remus BMW G80 G82 Racing Secondary-Cat-replacement Tube enhances this potential by improving exhaust gas flow. A wider pipe diameter—76 mm compared to the OEM 70 mm—allows the turbochargers to spool more freely, reducing lag and enhancing throttle response.

On closed-track environments, this translates into sharper acceleration and improved consistency under high-load driving conditions. Whether you're seeking faster lap times or simply a more visceral driving experience, this upgrade delivers immediate and noticeable results.

Sound Enhancement and Driving Experience

One of the biggest reasons enthusiasts install the Remus Racing Secondary-Cat-replacement Tube is for the sound transformation. The factory BMW M3 and M4 exhaust systems are restricted due to emissions and sound regulations. With the secondary catalytic converters removed, the exhaust becomes significantly more aggressive, with sharper pops, deeper tones, and a louder overall character.

The difference is especially appreciated during track days, spirited weekend drives, or when paired with a full Remus cat-back system for maximum impact.

Construction, Materials, and Quality

Remus is known for uncompromising build quality, and this component is no exception. The Racing Secondary-Cat-replacement Tube is crafted from premium stainless steel, shot-blasted for a uniform finish, and designed for long-term reliability even under extreme temperatures. Each unit is handmade in Austria, ensuring exact tolerances and world-class craftsmanship.

The lightweight design also contributes to overall performance improvements by reducing the mass of the exhaust system compared to factory components.

Compatibility and Fitment

This product is designed exclusively for the following models, with or without gasoline particulate filters (GPF):

BMW M Series G80 M3 (2021+)
BMW M Series G80 M3 Competition (2021+)
BMW M Series G82 M4 (2021+)
BMW M Series G82 M4 Competition (2021+)

Buyers can provide a UK registration number or the last seven digits of their VIN for a compatibility check before dispatch, ensuring perfect fitment for their vehicle. The part number for this component is 081021 1100.

Important Notes for Installation and Use

This Remus Racing Secondary-Cat-replacement Tube is strictly a racing part and has no ECE approval. It is not permitted for public road use. Installation requires cutting the original exhaust system, and due to the removal of catalytic converters, an ECU remap is recommended to optimize performance and prevent check engine lights from appearing. This step also helps drivers extract the full benefit of the freer-flowing exhaust system.

Who Should Consider This Upgrade?

The Remus BMW G80 G82 Racing Secondary-Cat-replacement Tube is ideal for:

Track-day enthusiasts seeking maximum exhaust flow and sharper performance.
BMW M3 and M4 owners wanting a dramatically more aggressive exhaust note.
Drivers building a full aftermarket exhaust system for motorsport use.
Anyone pursuing improved turbo response and reduced back pressure on the S58 engine.

If your goal is pure performance and sound enhancement, this component is one of the most effective upgrades available for the G80/G82 platform.

Conclusion

The Remus BMW G80 G82 Racing Secondary-Cat-replacement Tube (M3, M3 Competition, M4 & M4 Competition) is a high-quality, track-focused exhaust upgrade that significantly enhances sound, performance, and driving engagement. With its precision engineering, stainless-steel construction, and racing pedigree, it is a top choice for BMW owners seeking to unlock the full potential of their S58-powered machine. For motorsport environments and performance-oriented builds, this Remus racing component is a standout addition.