Milltek Hi-Flow Sports Cat & Downpipe for Mercedes C-Class C63 & C63 S (W205) Saloon 4.0 Bi-Turbo V8 (Non-GPF Equipped Models Only) (2015 onwards) – Improved Flow, Sports Catalyst
This is Milltek's large-bore downpipe with hi-flow sports cat for the Mercedes C-Class C63 & C63 S (W205) Saloon 4.0 Bi-Turbo V8 (Non-GPF Equipped Models Only). It replaces the restrictive factory downpipe with a larger-bore pipe fitted with a high-flow sports catalyst in place of the standard unit, using a less dense substrate that flows significantly better than the factory cat while still treating the exhaust gases passing through it.
It sits between a stock downpipe and a full de-cat: a genuine flow gain suited to a Stage 1 or Stage 2 remap, without giving up the catalyst entirely the way a de-cat pipe does.
In the UK, a replacement catalyst on a car first registered from 1 March 2001 needs ECE R103 type-approval to be road legal, so check the EC Approved line in the specification for the version you choose.
Specifications
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System Type: Hi-Flow Sports Cat and Downpipe
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Pipe Diameter: 76.2mm (3")
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EC Approved: No
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Race System: Yes
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Fitting Time: approx. 2.5 to 3 hours (Milltek figure)
Key Features
- Made from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration
- Mandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow
- 76.2mm (3") pipework
- High-flow sports catalyst flows better than the dense factory unit while still treating exhaust gases
- Designed, developed and manufactured in the UK by Milltek Sport
Fitment
- Mercedes C-Class C63 & C63 S (W205) Saloon 4.0 Bi-Turbo V8 (Non-GPF Equipped Models Only) (2015 onwards)
Not suitable for: Mercedes C-Class C63 GPF models, or any model not listed above.
Installation
Milltek quotes a fitting time of approx. 2.5 to 3 hours. Before ordering, note: Replaces OE Primary and Secondary Cats, Requires Gearbox Removal for Fitting - Fits with OE Cat Back. This work involves removing parts close to the turbo and engine, so we recommend fitting by a specialist with a ramp and suitable software support.
Upgrade Further
Also available from Milltek for this car: Milltek Active Valve Control Mercedes C-Class C63 & C63 S W205 Saloon 4.0 Bi-Turbo V8 Non-GPF 15+, Milltek Rear Silencers Mercedes C-Class C63 & C63 S W205 Saloon 4.0 Bi-Turbo V8 Non-GPF 15+.
Is it road legal?
Milltek lists this as a race part without EC approval, so it is intended for off-road and competition use.
Do I need a remap?
A suitable remap is strongly recommended, as the engine management needs to account for the change in flow and sensor readings. Speak to your tuner before fitting.
Can I use it with my standard exhaust?
Yes. Milltek lists it for use with the factory (OE) exhaust system.
How is a sports cat different from a de-cat?
A sports cat still contains a catalyst, just a less dense one that flows better than the factory unit. A de-cat removes the catalyst completely.
How long does it take to fit?
Milltek quotes approx. 2.5 to 3 hours.
What is it made from?
T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.
Is there a warranty?
Yes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.
