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Exhaust› Exhaust Pipes, Systems and Components

Milltek Sport

Catless Downpipe

Name: Catless Downpipe
Brand: Milltek Sport
SKU: SSXM023

$533.45

SKU: SSXM023

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$100 Minimum Order

Non-Returnable Item

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Moderate — 2–4 hours

Overview

The Milltek Sport SSXM023 is a large-bore, catless downpipe designed for Gen2 MINI Cooper S models. This downpipe does not contain a catalytic converter.

Show original supplier description

The Milltek Sport SSXM023 is a performance-oriented, large-bore downpipe designed to replace the restrictive factory unit on Gen2 MINI Cooper S models. Constructed from aerospace-grade type 304, non-magnetic stainless steel, this downpipe is built for longevity and resistance to discoloration. It features a 2.5-inch (63.5mm) pipe diameter, enlarged over stock to optimize gas flow and enhance performance without sacrificing mid-range torque. The system is specifically designed as a large-bore, de-cat (catless) configuration. This means it does not have a catalytic converter, which is crucial for maximum exhaust flow but also has significant implications for road legality and emissions testing. This product is intended for use exclusively with Milltek's Cat-Back exhaust systems and will not fit on a stock exhaust setup. Installation of the SSXM023 downpipe requires a stage 2 ECU remap. Due to the absence of a catalytic converter, this downpipe will not pass any emissions tests and is therefore intended for track-use only. Expect a check engine light, especially if other modifications are present. Fitment is confirmed for various Gen2 MINI Cooper S models, including: * R55-S Clubman: 2008-2015 * R56-S Hatchback: 2007-2013 * R57-S Convertible: 2009-2015 * R58-S Coupe: 2011-2015 * R59-S Roadster: 2012-2015 * R60-S Countryman: 2011-2016 * R61-S Paceman: 2013-2016

Vehicle Symptoms

Sluggish acceleration at high RPM
Check engine light on
Exhaust odor in cabin
Reduced fuel economy
Turbo lag under load

Diagnostic Codes

P0420 – Cat Efficiency Below Threshold
P0430 – Cat Efficiency Below Threshold (B2)

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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 Sport
Part Number	SSXM023
Category	Exhaust

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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.

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