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Milltek Sport

Cat Back Exhaust System (Twin 76.2mm, Quad 76.2mm Tailpipes)

$1,776.20

SKU: SSXAU046

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Milltek Cat Back exhaust system is designed for the Audi S4 4.2 V8 quattro B7 models from 2004 to 2009. This system replaces everything from the catalytic converter back, offering a complete performance upgrade with improved throttle response and flow. It features twin 76.2mm pipes and quad 76.2mm tailpipes, crafted from type-304 aircraft-grade stainless steel, providing a deeper, more aggressive exhaust tone.
Show original supplier description
The Milltek Cat Back exhaust system is meticulously engineered for the Audi S4 4.2 V8 quattro B7 Saloon/Sedan, Avant, and Cabriolet models produced between 2004 and 2009. This comprehensive system replaces the factory exhaust from the catalytic converter backward, delivering a significant enhancement in performance. It features twin 76.2mm pipes and culminates in quad 76.2mm tailpipes, all constructed from premium type-304 aircraft-grade stainless steel for superior durability and corrosion resistance. The resonated design ensures a deeper, more aggressive exhaust note without being excessively loud, providing an enhanced auditory experience that complements the car's performance. Each component is crafted for a direct fit, ensuring seamless integration with the original equipment and simplifying the installation process, with no modifications required. Milltek Sport recommends professional installation by a certified dealer to ensure the exhaust is fitted safely and correctly. The system is designed as a direct replacement for the factory exhaust, guaranteeing compatibility with OEM components and an easy installation.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandMilltek Sport
Part NumberSSXAU046
CategoryExhaust
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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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