Cat-Back Exhaust

Milltek Resonated Cat-Back Exhaust | Audi B9 S4 S5 - Carbon Fibre Tips

Brand: Milltek

Part #: SSXAU721

$4,120.57+4120 pts

In Stock

SKU: MK-SSXAU721

Ships direct from the warehouse Guaranteed fitment 30-day returns

Description

Milltek Resonated Cat-Back Exhaust System for Audi B9 S4 and S5 3.0 V6 Turbo (2016+). Direct factory fitment replacement with 2.50" (63.50mm) mandrel-bent T304L stainless steel construction. Engineered for Sport Differential models without brace bars. Hand-finished quad JET-100 carbon fiber trim outlets deliver a refined OE+ tone character without excessive drone. The resonated design fine-tunes the OEM resonance point for a sportier, more pronounced soundtrack while maintaining street-legal comfort. CNC-formed silencers and precision welds ensure durability and corrosion resistance. Fitment • Audi B9 S4 Saloon/Avant (2016+) - Sport Differential models only, without brace bars • Audi B9 S5 Sportback (2017+) - Sport Differential models only, without brace bars • Engine: 3.0L V6 Turbo (EA839) • Uses OEM hangers and mounting points - no modification required Specifications • Pipe diameter: 2.50" (63.50mm) mandrel-bent • Material: T304L stainless steel, hand-finished • Resonated: Yes - engineered tone with drone elimination • Outlets: Quad JET-100 carbon fiber trim • System type: Cat-back (OEM catalytic converters retained) EC type-approved for global compliance. Designed and manufactured in the UK with 40+ years of performance exhaust heritage. Tested at the Nurburgring.

Check Vehicle Fitment

Fits 22 vehicles including:

2016 Audi S4— 3.0 Turbo V6 B9 - Saloon/Sedan & Avant (ONLY - Sport Diff Models Only & Without Brace Bars) - Left Hand Drive Cars Only > 2016 and Later
2018 Audi S4— 3.0 Turbo V6 B9 - Saloon/Sedan & Avant (ONLY - Sport Diff Models Only & Without Brace Bars) - Left Hand Drive Cars Only > 2016 and Later
2019 Audi S4— 3.0 Turbo V6 B9 - Saloon/Sedan & Avant (ONLY - Sport Diff Models Only & Without Brace Bars) - Left Hand Drive Cars Only > 2016 and Later
2020 Audi S4— 3.0 Turbo V6 B9 - Saloon/Sedan & Avant (ONLY - Sport Diff Models Only & Without Brace Bars) - Left Hand Drive Cars Only > 2016 and Later
2021 Audi S4— 3.0 Turbo V6 B9 - Saloon/Sedan & Avant (ONLY - Sport Diff Models Only & Without Brace Bars) - Left Hand Drive Cars Only > 2016 and Later
2022 Audi S4— 3.0 Turbo V6 B9 - Saloon/Sedan & Avant (ONLY - Sport Diff Models Only & Without Brace Bars) - Left Hand Drive Cars Only > 2016 and Later
+ 16 more vehicles