Audi S3 8V Sportback 5dr MK3 (2013-2018) Valved Cat Back/Catback Exhaust System | Switchable Valve-Controlled T304 Stainless, 3" (76mm) | Resonated or Non-Resonated | Retains Drive Select OEM Flaps | Pre-OPF/Non-GPF | UK Made | DSG/S tronic Compatible

Transform your MK3 Audi S3 8V Sportback 5dr with a premium valve-controlled stainless steel rear system that elevates sound, response and aesthetics. This switchable flap-equipped upgrade keeps the factory valve functionality and integrates seamlessly with Audi Drive Select, giving you a refined tone in Comfort and a more aggressive soundtrack in Dynamic. It is the ideal stainless catback for anyone who wants a deeper, richer exhaust note without unwanted cabin drone.

Why enthusiasts choose this upgrade

• Crafted from T304 stainless steel with precision TIG welding for durability and a factory-quality fit.
• 76.2 mm 3 inch bore for improved flow on the 2.0 TFSI quattro platform.
• Valve-compatible system retains the OEM electronic flap control via Drive Select.
• Two sound levels available: resonated for subtle refinement or non-resonated for a louder, sportier tone.
• No cabin drone in real-world cruising, even with the valves open.
• All necessary clamps, gaskets and fittings are included.

Sound options

Choose the resonated configuration if you want a smooth, OE-plus soundtrack for daily driving. Go non-resonated if you prefer a more pronounced, motorsport-inspired tone. With valves open, the system delivers a thrilling, aggressive note and on S tronic models the gear changes are enhanced with a sharper, sportier crack. In testing, the non-resonated catback measured an increase of around +13 dB in Dynamic mode while maintaining comfort when cruising.

Construction and finish

Built in the UK from mandrel-bent T304 stainless steel and TIG welded throughout, this performance system is designed to resist corrosion and look as good as it sounds. Tailpipe options include 90 mm polished tips as standard, with optional Ceramic Black and Carbon Fibre finishes to complete the rear end of your 8V Sportback.

Fitment and compatibility

• Audi S3 8V Sportback 5 door, model years 2013 to 2018.
• Fits from the catalyst section back and replaces the centre and rear sections.
• Retains the original valve control and integrates with Audi Drive Select modes.
• Non-GPF pre-OPF cars only. Not suitable for GPF/OPF vehicles.

Upgrade paths and tuning

This 3 inch system pairs perfectly with sports cat or de-cat front sections to create a full turbo-back setup. Combine with a quality ECU calibration for noticeable performance gains and an even freer-revving character from your 2.0 TFSI.

What you get

• High-flow stainless rear system with valve integration.
• Choice of resonated or non-resonated centre section.
• 90 mm tailpipes in your selected finish.
• All required hardware and gaskets for installation.

Installation service

Want it fitted professionally? Book installation with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a tailored quote and lead times. Our team has installed this setup on multiple S3 8V cars and customers consistently praise the build quality, perfect fitment and the addictive, valve-controlled sound.

Video gallery

5 Door Sportback valve-controlled system in action:

Search-friendly fitment terms

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