Remus Non-Resonated Valved Cat-Back Exhaust System for Audi RS4 B9 Avant 2.9 V6 Biturbo (2017+) - Quad 84mm Tips, Stainless Steel, EEC Approved, OEM Valve Control - No GPF

Remus Sports Catback for Audi RS4 Avant B9 2.9 TFSI Twin Turbo

Unlock the RS4 soundtrack with a premium Austrian-made system that retains the factory flap control for quiet cruising and an intoxicating roar on demand. This non-silenced centre section delivers a deeper, more purposeful tone while the low back pressure design helps the twin-turbo V6 breathe more freely. Built from shot-peened stainless steel with precision fitment and quad 84 mm outlets, it is the upgrade enthusiasts choose for sound quality, durability and everyday usability.

Ideal for anyone searching for RS4 B9 sports exhaust, Audi B9 estate performance system, switchable flap exhaust for RS4, stainless catback for Audi 2.9 TFSI, quad exit 84mm tailpipes, EU type approved exhaust, Austrian performance exhaust, vacuum flap exhaust upgrade, non silenced centre section, Remus Austria exhaust for RS4, direct replacement performance exhaust, RS4 sound upgrade UK.

Highlights

• Factory flap integration for quiet or loud at the touch of a button
• Distinctive, motorsport-inspired tone with the centre silencer removed
• Reduced back pressure for improved response
• Lightweight stainless construction with a premium shot-peened finish
• Accurate fit and alignment engineered specifically for the B9 platform
• Handcrafted in Austria with EU type approval

Specification

• Layout: Non-resonated catback, left and right configuration
• Flap control: Vacuum actuated using the original vehicle system
• Tailpipes: Quad outlets, 4 x 84 mm
• Material: High grade stainless steel, shot-peened

Vehicle suitability

• Make: Audi
• Model: RS4 Avant, B9 platform
• Engine: 2.9 TFSI V6 twin turbo, engine code DECA
• Output: 331 kW
• Years: 2017 onwards
• Compatibility note: For cars without GPF or OPF

Tailpipe options

• 4 x 84 mm straight, carbon insert
• 4 x 84 mm angled, carbon ring
• 4 x 84 mm Black Chrome, straight, carbon insert
• 4 x 84 mm Carbon, angled, Titanium internals
• 4 x 84 mm angled, rolled edge, chromed

Real-world feedback

We have installed this system for RS4 owners and it consistently impresses. Clients love the deep, characterful note with the valves open, the refined tone when closed, and the flawless fit and finish. It transforms the car’s presence without compromising day-to-day comfort.

Installation and support

Professional fitting available at MJ Modifications in Warwickshire. Request a quote: info@mjmodifications.co.uk.

Search terms

RS4 B9 sports exhaust, Audi RS4 2.9 TFSI twin turbo catback system, RS4 estate quad exit exhaust, flap controlled exhaust for RS4, stainless steel performance system, EU homologated exhaust, Austrian made exhaust, quad 84mm tips, vacuum flap muffler, RS4 exhaust upgrade UK, B9 RS4 sound enhancement, non resonated centre section, Remus Austria performance exhaust, direct fit Audi RS4 catback, RS4 2017 on performance exhaust.