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

Audi RS 4 B9 Avant 2.9 TFSI V6 Twin Turbo Sports Exhaust Upgrade – Non‑resonated, valve‑controlled, quad 84 mm tailpipes, stainless construction, EEC homologation

Transform your RS 4 estate with a premium rear section designed for drivers who want serious tone and sharper response. This straight‑through, flap‑controlled system is built from stainless steel throughout with a shot‑blasted finish, delivering a deep, motorsport character when the valves are open and refined cruising when closed. It keeps factory flap control via the original vacuum actuators and is hand‑built in Austria for superb fit and durability. EEC homologation means quality and compliance are baked in.

Highlights at a glance

• Switchable sound via factory flap control for quiet or full‑volume drive modes
• Non‑resonated, free‑flow design for reduced restriction and vivid tone
• Stainless steel pipework and silencers with a premium shot‑blasted surface
• Optimised flow for keener throttle response and low back‑pressure
• Lightweight, precision build with excellent fit on the B9 platform
• Handmade in Austria with outstanding weld quality and finish
• EEC homologated for road use where applicable
• Quad 84 mm tailpipes with multiple tip styles to suit your RS 4

Compatibility

• Vehicle: Audi RS 4 Avant B9 estate
• Engine: 2.9 TFSI V6 twin‑turbo petrol
• Engine code: DECA, 331 kW
• Model years: 2017 onwards

Note: for cars without a petrol particulate filter. Not suitable for OPF or GPF equipped vehicles.

Tailpipe options – Ø 84 mm, quad exit

• Straight tip with carbon insert
• Angled tip with carbon ring
• Black chrome, straight tip with carbon insert
• Full carbon, angled with titanium inner
• Angled, rolled edge, chrome finish

Why RS 4 owners choose this system

Open the valves for a hard‑edged, race‑bred soundtrack with crisp upshift cracks and a rich burble. Close the flaps for civilised everyday driving. The free‑flowing layout and carefully tuned box geometry help the 2.9 twin‑turbo breathe, enhancing responsiveness without drone. It looks as good as it sounds, with immaculate fabrication and tailpipe options that suit OEM+ builds or full show‑car statements.

Fitting and support

We have installed this RS 4 B9 system at MJ Modifications and feedback from our customers has been fantastic for sound quality, finish and fitment. Want it supplied and fitted by specialists? Book installation at MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a quote.

Search terms our customers use

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