• Catless stainless steel downpipe for Mercedes-AMG CLA45 and GLA45 with M133 engine
  • Pair of M133 AMG catless downpipes showing mandrel-bent stainless construction
  • 3 inch diameter measurement of M133 AMG stainless steel downpipe
  • Detail view of welds and flex section on M133 AMG catless downpipe
  • Mercedes CLA45 AMG GLA45 AMG M133 catless downpipe main curved section with flange
  • CLA45 GLA45 M133 catless downpipe connecting pipe and bend detail
  • Mercedes CLA45 GLA45 catless downpipe outlet bend and flange detail
  • O2 sensor bung and port detail on Mercedes CLA45 AMG GLA45 M133 catless downpipe
  • Mercedes CLA45 AMG GLA45 AMG M133 catless downpipe flange and outlet end detail
  • CLA45 GLA45 M133 catless downpipe showing O2 sensor bung, bracket, and angled section
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BenzUnited Parts

M133 Catless Downpipe for Mercedes CLA45 / GLA45 AMG (2014–2019)

M133 Catless Downpipe for Mercedes CLA45 / GLA45 AMG (2014–2019)

$495.00 USD
$699.00 USD $495.00 USD
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Mercedes-AMG CLA45 / GLA45 • M133 Engine

The factory M133 downpipe is a major restriction on the CLA45 and GLA45. This high-flow catless downpipe removes that bottleneck for noticeably quicker turbo spool, stronger mid-range torque, sharper throttle response, and a much more aggressive exhaust note.

The CLA45/GLA45 is one of the easiest platforms to make serious power — and this downpipe is one of the most effective first mods you can do.

🚀 Faster Turbo Spool
Quicker boost and sharper response
🔥 Stronger Mid-Range Torque
Noticeable power delivery improvement
🛠 Direct Bolt-On
No cutting • OEM V-band compatible

Why Upgrade Your Factory Downpipe?

The factory M133 downpipe is a major bottleneck once you increase boost. This 3.0” catless downpipe dramatically reduces backpressure, allowing your turbo to spool faster and breathe more freely — delivering quicker response, stronger mid-range power, and a much more aggressive exhaust note.

Make Real Power on Your CLA45/GLA45

Pair this downpipe with our JB4 tuner, ECU reflash, diverter valve, or high-flow filter for the easiest and most effective power upgrade on the M133 platform.

Shop Supporting Mods →

Key Features

  • 3.0” mandrel-bent 304 stainless steel for maximum flow
  • CNC-machined flanges for perfect OEM-style fitment
  • Integrated flex section with braided outer shield and interlock liner
  • OEM-style O₂ sensor bungs correctly positioned
  • Direct bolt-on installation — no modifications needed

Vehicle Fitment

  • Mercedes-Benz CLA45 AMG — 2014–2019
  • Mercedes-Benz GLA45 AMG — 2015–2019

M133 engine only

Important Use Notice

Intended for off-road / competition use only. Installation on a street vehicle may trigger a check engine light without proper ECU tuning.

Warranty & Installation

  • 1-Year Limited Warranty
  • Direct bolt-on — professional installation recommended

Need help confirming fitment or tuning requirements?

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Fast shipping from USA • Fitment support available • AMG-focused performance parts

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