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Mercedes M133 W.4 Turbocharger Tuner System
Purchase Mercedes M133 W.4 Turbocharger Tuner System
  • SKU: 01-133-01662-3

    Mercedes M133 W.4 Turbocharger Tuner System

  • Advertised gains are estimates of HP and Torque “at the engine” calculated from gains as measured on a Dynojet Dynamometer in ideal conditions and typically show the largest possible change.  Actual gains are dependent on the following: Learn More about Crank HP Vs Wheel HP

    Model – Manufacturers use the same engine in multiple model vehicles and often times they are in a different state of tune, for example: 2008 C63 and a 2008 CLK Black Series.  Both have the same engine, but the C63 has 451hp while the CLK63 has 500hp.  Naturally the C63 will show more gains as it starts at a lower level.

    Model Year – Similar to above, as time progresses, Manufacturers tend to slightly increase power output via software from one year to the next or offer “Performance Packages” with increased power.  The engines remain largely unaltered and as a result, final tuned output remains the same, while the gains are lower as the starting point is now higher.

    Fuel – Fuel quality is HIGHLY important with performance vehicles.  Low quality and/or low octane fuel will greatly impact engine output and potentially even engine health.  Top tier brand premium fuels should always be used to achieve the best results possible.

    Drivetrain – All wheel drive has higher drivetrain losses than rear wheel drive.  This results in lower numbers when testing on a chassis dyno.  Wheel/tire size and weight will also impact chassis dyno results

    Weather/Conditions – Temperature, humidity, altitude, and air density all impact engine performance.  Heat, high humidity, and thin air will all work towards reducing engine output

    Engine Health – Higher miles tends to result in increased build up and lower compression which can and will impact engine output.  Properly maintained engines will have better performance than abused or neglected engines.

    Supporting modifications – The highest power levels require supporting modifications.  Depending on the engine, this could mean forged internals, built transmission, upgraded fuel system, 110+ octane race fuel, etc.

  • $7,399.00 $7,399.00

  • Prop 65 warning

    This product can expose you to chemicals including carbon black, silica - crystalline, formaldehyde, and lead which are known to the State of California to cause cancer, and lead, which is known to the State of California to cause birth defects or other reproductive harm. For more information go to

Weistec Horsepower 586
Weistec Torque 631
Turbo Type W.4 (Complete Replacement)
Manufacturer Weistec
Street legal in all the US States No
Engine Family M133
See more
year make model trim engine
2019 Mercedes-Benz GLA45 AMG Base (X156) Turbocharged 2L I4 (M133)
2018 Mercedes-Benz GLA45 AMG Base (X156) Turbocharged 2L I4 (M133)
2017 Mercedes-Benz GLA45 AMG Base (X156) Turbocharged 2L I4 (M133)
2016 Mercedes-Benz GLA45 AMG Base (X156) Turbocharged 2L I4 (M133)
2015 Mercedes-Benz GLA45 AMG Base (X156) Turbocharged 2L I4 (M133)
2014 Mercedes-Benz GLA45 AMG Base (X156) Turbocharged 2L I4 (M133)
See more

Product Description

* Allow 2-3 weeks for orders to be shipped. Turbocharger systems are made to order.

Please contact to see if a tune is available for these turbos on your specific application.


Comprehensive Upgrade

The Weistec Engineering M133 W.4 Turbo Upgrade is a full turbocharger replacement solution for those looking to make significantly higher power than the stock frame turbocharger is capable of generating.

The turbo upgrade, as with all W.4 Upgrades, is a comprehensive turbo upgrade that completely replaces the factory turbocharges and exhaust manifolds. For the M133 engine, the W.4 Turbo is based on the Garrett GTX3071r Gen 2 ball bearing units with CNC machined billet aluminum compressor wheel rated much higher than the stock unit. The Weistec compressor cover provides mounting for the OEM wastegate actuator, is compatible with the stock charge piping, and has provisions for the Weistec Anti Surge Valve. A 3 inch inlet is standard to provide unrestricted flow to the compressor wheel.

The turbo upgrade features a Weistec high flow cast stainless steel twin scroll turbo manifold. The inlet ports, runners, and outlet are substantially larger than the factory manifold to support very high power levels. The cast stainless steel design was chosen for both reliability and performance. The Weistec Cast Stainless Steel Twin Scroll Manifold is incredibly h3 and sturdy in comparison to tubular manifold designs which have a tendency to crack and leak. A cast manifold is also better at retaining heat than a tubular manifold, resulting in quicker response from the turbocharger.

The entire system will mate up with the stock downpipe, or the Weistec M133 Downpipe.

Custom tuning by your local tuner of choice is required

Key Features

  • Garrett GTX3071r Gen 2 CHRA
  • Twin Ball Bearing Turbocharger
  • Weistec M133 Compressor Cover
  • Weistec Cast Stainless Steel M133 Twin Scroll Manifold
  • Weistec W.4 Turbo Heat Shield
  • Custom Turbo Coolant Lines and Fittings
  • Custom Turbo Oil Lines and Fittings
  • Bolt on installation
  • All hardware and gaskets are included
  • 500+HP Capable with supporting upgrades*
  • Designed to use Weistec M133 Downpipe, Weistec M133 Intake System, and Weistec M133 Anti Surge Valve for maximum performance
  • Compatible with Factory Downpipe
  • Reuses Stock Wastegate Actuator
  • No Core Charge
Note: This item is considered special order. (See Terms and Conditions)