80mm Non-Resonated Cat-Back Exhaust System

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Milltek

80mm Non-Resonated Cat-Back Exhaust System

Name: 80mm Non-Resonated Cat-Back Exhaust System
Brand: Milltek
SKU: SSXAU974

$3,697.92 $3,228.29 Save $469.63

SKU: SSXAU974

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Overview

The Milltek SSXAU974 is a particulate filter-back exhaust system designed for the Audi RS3 Saloon/Sedan 400PS (8Y MQB EVO) from 2022. This system features 80mm (3.15-inch) piping and is a non-resonated, race version for the loudest sound. It is constructed from aerospace-grade type 304, non-magnetic stainless steel for durability and resistance to discolouration. Mandrel bending ensures optimized gasflow, with enlarged bore diameters to enhance performance without sacrificing mid-range torque.

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The Milltek SSXAU974 is a non-resonated, race particulate filter-back exhaust system engineered for the Audi RS3 Saloon/Sedan 400PS (8Y MQB EVO) model years 2022 and beyond. It features 80mm (3.15-inch) piping with mandrel-bent curves for optimal gas flow, and enlarged bore diameters designed to maximize performance without compromising mid-range torque. This exhaust system undergoes a rigorous acoustic development process to achieve a sporty and crisp tone, while actively preventing NVH, drone, and cabin resonance. It is designed as a direct replacement for the stock exhaust, offering an aggressive, deep sound profile. The "Race Non Resonated (Loudest)" configuration ensures maximum volume. It is important to note that the use of de-cats and sports cats is intended for off-road or motorsport use only and would prevent a vehicle from passing an MOT test. Only EC type-approved components are legal for road use. This specific system is designed for the Saloon/Sedan variant of the 8Y RS3 and may not fit other body styles such as the Sportback.

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.

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Specifications

Brand	Milltek
Part Number	SSXAU974
Category	Exhaust

Videos

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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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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.

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