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Mercedes-Benz

W.4 Turbo Upgrade M178
Purchase W.4 Turbo Upgrade M178
  • SKU: 01-178-01908-5

    W.4 Turbo Upgrade M178

  • 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

    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.

  • $10,999.99

  • Prop 65 warning
    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 www.P65Warnings.ca.gov.

Weistec Horsepower 900
Weistec Torque 750
Turbo Type W.4 (Complete Replacement)
Manufacturer Weistec
Street legal in all the US States No
Engine Family M178
See more
year make model trim engine
2020 Mercedes-Benz AMG GT R Base (C190) Twin Turbo 4L V8 (M178)
2019 Mercedes-Benz AMG GT R Base (C190) Twin Turbo 4L V8 (M178)
2018 Mercedes-Benz AMG GT R Base (C190) Twin Turbo 4L V8 (M178)
2017 Mercedes-Benz AMG GT R Base (C190) Twin Turbo 4L V8 (M178)
2020 Mercedes-Benz AMG GT C Base (C190) Twin Turbo 4L V8 (M178)
2019 Mercedes-Benz AMG GT C Base (C190) Twin Turbo 4L V8 (M178)
See more

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

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


The Weistec Engineering M177 / M178 W.4 Turbo Upgrade is the key to making the most power with the M177 and M178 engines without compromise in drivability or reliability.

The turbo upgrade, as with all W.4 Upgrades, is a comprehensive turbo upgrade that completely replaces the factory turbocharges.  The new turbochargers are ball bearing units with CNC machined billet aluminum compressor wheels rated much higher than the stock units.  The Weistec compressor covers provide mounting for the OEM wastegate actuators and is compatible with the stock charge piping.  A 3 inch anti-surge inlet is standard to provide unrestricted flow to the compressor.

The Weistec Turbine Housings have V-Band inlets, to allow for a cleaner and easier install, and turbine outlets that not only match the factory location, also have the same flange design to use the same Weistec Downpipes and Midpipes as the stock turbos.


Key Features:

  • Twin Ball Bearing Turbochargers

  • Weistec M177/M178 Compressor Covers

  • Weistec Cast Stainless Steel  M177/M178 Turbine Housings

  • Custom Turbo Coolant Lines and Fittings

  • Custom Turbo Oil Lines and Fittings

  • Weistec Turbo Intake Couplers

  • Bolt on installation

  • All hardware and gaskets are included

  • 900+HP Capable with supporting upgrades

  • Designed to use Stock or Weistec Downpipes

  • Compatible with Factory Downpipes

  • Reuses Stock Wastegate Actuators 

  • No Core Charge


Note: This item is considered special order. (See Terms and Conditions)