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RMS Axle Back Exhausts - Remus 2021+ BMW M3 Competition Touring (G81) Axle Back Exhaust
The BMW M3 Competition Touring (G81) is the ultimate high-performance wagon, combining daily utility with the brutal power of the S58 twin-turbo inline-six engine. However, European emissions regulations and restrictive factory mufflers heavily muffle the car's acoustic potential. From the factory, the exhaust note feels overly restrained, hiding the true nature of the 503-horsepower powerplant. The RMS Axle Back Exhaust featuring the Remus performance rear silencer system (Part Number: 081021 1510TI) completely fixes this issue. This premium Austrian-engineered system frees up exhaust flow and unlocks a deep, aggressive racing growl under acceleration, while retaining excellent cabin comfort for long-distance family road trips.What sets this Remus axle-back system apart is its precision engineering and high-grade construction. Made entirely from shot-blasted aviation-grade stainless steel, this exhaust minimizes backpressure and optimizes flow dynamics across the entire RPM range. To give you complete visual control over your G81’s rear profile, this product is sold as a modular system. It replaces the heavy factory rear muffler assembly while relying on a separate matching connection tube and tailpipe set to complete the layout. This configuration integrates seamlessly with your wagon's existing rear diffuser setup, completely transforming the back of your vehicle with a clean, high-end motorsport look.Features and Benefits
Aggressive Sport Exhaust Note
This system replaces the heavily baffled factory rear suitcase muffler with an optimized straight-through internal silencer design. It amplifies the distinct, aggressive rasp of the S58 engine under heavy throttle, completely eliminating the muddy, muted tones of the stock setup.Shot-Blasted Stainless Steel Construction
The entire rear silencer assembly is built using premium shot-blasted stainless steel. This surface treatment relieves metal surface stress and provides maximum resistance to rust, cracking, and scaling after hundreds of extreme heat cycles.Advanced Internal Flow Dynamics
The interior structure of the Remus silencer is designed to minimize exhaust backpressure. By streamlining the path of spent exhaust gasses, it helps your twin-turbo engine move hot air away from the turbos more efficiently for sharper throttle response.OEM Electronic Valve Integration
This axle-back exhaust is engineered to accept your factory electronic exhaust valve actuators. By reusing the stock valve motors, you retain the ability to switch between a quiet, neighbor-friendly stealth mode and a loud, deep sport mode using your center console drive settings.Lightweight Modular Architecture
By using lightweight, thin-wall premium stainless steel, this system cuts down on unnecessary rear-end weight compared to the heavy stock muffler unit. This reduction in weight directly behind the rear axle helps sharpen the car's handling dynamics.Vehicle Fitment Matrix
This performance axle-back rear silencer is engineered as a direct replacement component for the following high-performance wagon platform:| Year Range | Vehicle Make | Model Submodel | Drivetrain & Configuration Requirements |
| 2021 – 2026+ | BMW | M3 Competition Touring (G81) | 3.0L Twin-Turbo S58 Inline-6 (AWD Wagon Only). Requires separate connection tube and tailpipe set. |
Technical Specifications
- Part Number: 081021 1510TI
- System Component: Axle-Back Performance Rear Silencer (Muffler Box)
- Material: Shot-Blasted Aviation-Grade Stainless Steel
- Valve Design: Integrated dual mechanical valve ports for factory actuator relocation
- Axle Placement: Rear Axle Exhaust Section Only
- Required Extras: Requires connection tube and tailpipe tip set to complete installation
- Country of Origin: Engineered and Manufactured in Austria
Frequently Asked Questions (FAQ)
Why does this product description say a connection tube and tailpipe set are required?
Remus designs this exhaust using a modular system to give owners customization options. This specific part number (081021 1510TI) consists only of the rear main silencer (muffler body) assembly. To actually fit it onto your G81 M3 Touring, you need the connecting pipe to bridge the gap to your factory mid-pipes, as well as the tailpipe tips to finish the look at the rear bumper. Both of those pieces must be purchased separately.Will installing this axle-back system cause a Check Engine Light (CEL) on my G81 M3?
No, it will not. An axle-back system only replaces the rear muffler section located behind your car's factory emissions equipment. It does not alter or remove your catalytic converters or gasoline particulate filters (GPF/OPF) located further up the exhaust stream. Because your factory sensors remain completely untouched, the engine's computer will read normal emissions data and will not trigger any warning lights.Do I lose my factory exhaust valve functionality with this Remus system?
No, you keep full control over your exhaust modes. Remus engineers this rear silencer with custom mechanical valve mounts that line up perfectly with your stock BMW electronic actuator motors. During the install process, your mechanic will unbolt the factory valve motors from the stock exhaust and secure them onto the Remus brackets, allowing you to open or close the valves using your car's factory driving modes.- ⚠️ Note: Connection tube and tail pipe set are required and sold separately. Please add the appropriate connection tube and tail pipe set to complete your system.
- Part Number: 081021 1510TI
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