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Exhaust› Catalytic Converters

Milltek

High-Flow Catalyst Downpipe

Name: High-Flow Catalyst Downpipe
Brand: Milltek
SKU: MIL-SSXVW635

$1,380.98 $1,294.95 Save $86.03

SKU: MIL-SSXVW635

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Non-Returnable Item

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Moderate — 2–4 hours

Overview

This downpipe features a larger diameter than standard OEM parts, allowing for increased gas flow from the engine. It is constructed from T304 stainless steel and includes a high-flow catalyst with 200 CPSI.

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Fabricated from aerospace-grade T304 stainless steel, this downpipe boasts a larger diameter compared to stock components, which facilitates improved exhaust gas flow and, consequently, increased engine efficiency. It incorporates a high-flow catalytic converter with 200 CPSI (cells per square inch). The construction utilizes mandrel-bent piping to ensure consistent radius bends for optimized gas flow, with enlarged bore diameters over stock to maximize performance without sacrificing mid-range torque. Milltek exhaust systems undergo a rigorous acoustic development process to achieve a sporty and crisp tone, while actively preventing NVH, drone, or cabin resonance. Important fitment notes include the requirement for a Stage 2 ECU Remap. This downpipe is specifically designed for the VW Golf Mk8 R 2.0 TSI 320PS (GPF Equipped Models Only) from 2021-2023 and the Audi S3 8Y Sedan 2.0T from 2022-2024. It is not an EC-approved or race system. The product may also be subject to California's Proposition 65 warning regarding cancer and reproductive harm.

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

Brand	Milltek
Part Number	MIL-SSXVW635
Category	Exhaust

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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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