{"product_id":"milltek-audi-b9-s4-hjs-tuning-ece-downpipes","title":"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 \u0026 Milltek Cat-Back Exhaust - SSXAU725 - Saloon \u0026 Avant","description":"\u003cdiv class=\"product__description rte\"\u003e\n  \u003ch2\u003eSSXAU725 HJS Catted Front Pipes for Audi S4 B9 3.0T V6\u003c\/h2\u003e\n\n  \u003cp\u003eGive 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.\u003c\/p\u003e\n\n  \u003cul\u003e\n    \u003cli\u003eBuilt specifically for the Audi S4 B9 3.0T V6, Saloon and Avant, 2016 onwards\u003c\/li\u003e\n    \u003cli\u003eHJS Tuning ECE compliant sports catalysts for street-ready performance\u003c\/li\u003e\n    \u003cli\u003eDirect fit to OEM rear system or Milltek Sport cat-back assemblies\u003c\/li\u003e\n    \u003cli\u003eSemi-gloss black Cerakote finish for heat management and corrosion resistance\u003c\/li\u003e\n    \u003cli\u003e63.5 mm tubing to reduce restriction and improve exhaust gas velocity\u003c\/li\u003e\n    \u003cli\u003eDesigned, developed and manufactured in the United Kingdom\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eWhat you will feel\u003c\/h3\u003e\n  \u003cp\u003eCrisper 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.\u003c\/p\u003e\n\n  \u003ch3\u003eFitment guide\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eAudi S4 B9 3.0T V6 Saloon and Avant non Sport Differential models\u003c\/li\u003e\n    \u003cli\u003eAudi S4 B9 3.0T V6 Saloon and Avant Sport Differential models only where the vehicle is without brace bars\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eTechnical details\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eTubing diameter: 2.50 inches 63.50 mm\u003c\/li\u003e\n    \u003cli\u003eCoating: Cerakote semi-gloss black\u003c\/li\u003e\n    \u003cli\u003eConnection: bolts to stock rear section and Milltek Sport cat-back systems\u003c\/li\u003e\n    \u003cli\u003eApproval: ECE compliant\u003c\/li\u003e\n    \u003cli\u003ePart number: SSXAU725\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eProfessional installation\u003c\/h3\u003e\n  \u003cp\u003eWant 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.\u003c\/p\u003e\n\n  \u003ch3\u003eCompatibility check\u003c\/h3\u003e\n  \u003cp\u003eWe 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.\u003c\/p\u003e\n\n  \u003ch3\u003eSearch terms customers use\u003c\/h3\u003e\n  \u003cp\u003eAudi S4 B9 catted downpipes, S4 3.0T front pipes, HJS catalyst S4 B9, black ceramic coated downpipes, S4 B9 exhaust upgrade UK, Audi S4 high flow cats, B9 S4 performance front section, S4 Avant exhaust parts, S4 Saloon catted front pipes, Milltek Sport front pipes, S4 B9 turbo V6 exhaust, UK road legal S4 exhaust, SSXAU725 downpipes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"MillTek","offers":[{"title":"Default Title","offer_id":56008648327554,"sku":null,"price":3031.08,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/5445\/8937\/files\/MILLTEKAUDIB9S4HJSTUNINGECEDOWNPIPES_1946x_53160322-2ad3-4a0e-a84e-30203a0997ad_1024x1024_2x-transformed.webp?v=1764090108","url":"https:\/\/mjmodifications.co.uk\/products\/milltek-audi-b9-s4-hjs-tuning-ece-downpipes","provider":"MJ Modifications","version":"1.0","type":"link"}