Milltek Downpipe & Sports Cat for Mercedes A-Class A45 & A45S AMG 2.0 Turbo (W177 Hatch Only) (2019-2021) – Improved Flow, Sports Catalyst
This is Milltek's large-bore downpipe with hi-flow sports cat for the Mercedes A-Class A45 & A45S AMG 2.0 Turbo (W177 Hatch 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: Large Bore Downpipe and Hi-Flow Sports Cat
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Pipe Diameter: 80mm (3.15")
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EC Approved: No
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Race System: Yes
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Fitting Time: approx. 4 to 5 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
- 80mm (3.15") 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 A-Class A45 & A45S AMG 2.0 Turbo (W177 Hatch Only) (2019-2021)
- Mercedes CLA-Class CLA45 & 45S AMG 2.0 Turbo Coupe & SHooting Brake (OPF/GPF Models) (2020-2021)
Not suitable for: the Mercedes A-Class A45 AMG 2.0 Turbo (W176), which needs the Milltek HJS Tuning ECE Downpipes Mercedes A-Class A45 AMG 2.0 Turbo W176 12-18.
Installation
Milltek quotes a fitting time of approx. 4 to 5 hours. Before ordering, note: Includes OPF/GPF Bypass - Requires Stage 2 ECU Software. Only for vehicles without temperature sensor in downpipe. 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 Filter-back Exhaust Mercedes A-Class A45 & A45S AMG 2.0 Turbo W177 Hatch 19-21.
Will it fit the Mercedes CLA-Class CLA45 & 45S AMG 2.0 Turbo Coupe & SHooting Brake (OPF/GPF Models)?
Yes. Milltek lists this part for the Mercedes CLA-Class CLA45 & 45S AMG 2.0 Turbo Coupe & SHooting Brake (OPF/GPF Models) as well as the other models in the fitment list above.
Does it fit the Mercedes A-Class A45 AMG 2.0 Turbo (W176)?
No. For that car, choose the Milltek HJS Tuning ECE Downpipes Mercedes A-Class A45 AMG 2.0 Turbo W176 12-18.
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?
Yes. Milltek notes: "Includes OPF/GPF Bypass - Requires Stage 2 ECU Software. Only for vehicles without temperature sensor in downpipe.". Without suitable software the engine management is likely to log faults.
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. 4 to 5 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.
