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MillTek

Milltek HJS Tuning Catted Downpipes/Front Pipes for Audi S4 B9 3.0 TFSI V6 (2016-on) - Sport/High-Flow Cats ECE Approved, Cerakote Black, 63.5mm - Fits OEM & Milltek Cat-Back Exhaust - SSXAU725 - Saloon & Avant

Milltek HJS Tuning Catted Downpipes/Front Pipes for Audi S4 B9 3.0 TFSI V6 (2016-on) - Sport/High-Flow Cats ECE Approved, Cerakote Black, 63.5mm - Fits OEM & Milltek Cat-Back Exhaust - SSXAU725 - Saloon & Avant

£3,031.08
£3,367.87 £3,031.08
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Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.

SSXAU725 HJS Catted Front Pipes for Audi S4 B9 3.0T V6

Give your B9-chassis S4 the performance edge with this premium pair of HJS catted front pipes from Milltek. Engineered in the UK for sharper response and stronger flow, this direct-fit front section brings a deeper, more engaging soundtrack while maintaining ECE compliance for road use. Finished in semi-gloss black Cerakote for serious heat protection and durability, it mates cleanly to the factory rear exhaust or a Milltek Sport cat-back for a true bolt-on upgrade.

  • Built specifically for the Audi S4 B9 3.0T V6, Saloon and Avant, 2016 onwards
  • HJS Tuning ECE compliant sports catalysts for street-ready performance
  • Direct fit to OEM rear system or Milltek Sport cat-back assemblies
  • Semi-gloss black Cerakote finish for heat management and corrosion resistance
  • 63.5 mm tubing to reduce restriction and improve exhaust gas velocity
  • Designed, developed and manufactured in the United Kingdom

What you will feel

Crisper throttle response, faster turbo pick-up and a richer, sportier tone without the harshness. Customers love the transformation. We have fitted this setup many times and feedback has been consistently positive on drivability and sound quality.

Fitment guide

  • Audi S4 B9 3.0T V6 Saloon and Avant non Sport Differential models
  • Audi S4 B9 3.0T V6 Saloon and Avant Sport Differential models only where the vehicle is without brace bars

Technical details

  • Tubing diameter: 2.50 inches 63.50 mm
  • Coating: Cerakote semi-gloss black
  • Connection: bolts to stock rear section and Milltek Sport cat-back systems
  • Approval: ECE compliant
  • Part number: SSXAU725

Professional installation

Want it fitted right first time? Book installation with MJ Modifications in Warwickshire. Our team can supply and fit, advise on pairing with your existing exhaust and ensure everything is aligned, sealed and rattle-free. Request a fitting quote at info@mjmodifications.co.uk.

Compatibility check

We verify fitment before dispatch. Add your UK registration number or the last 7 digits of your VIN at checkout so we can confirm suitability for your vehicle.

Search terms customers use

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