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W.4 Turbo Upgrade, Mercedes M157
Purchase W.4 Turbo Upgrade, Mercedes M157
  • SKU: 01-157-01864-3

    W.4 Turbo Upgrade, Mercedes M157

  • 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.

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  • 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 1008
Weistec Torque 900
Turbo Type W.4 (Complete Replacement)
Manufacturer Weistec
Street legal in all the US States No
Engine Family M157
See more
year make model trim engine
2015 Mercedes-Benz G63 AMG 6x6 6x6 (W463) Twin Turbo 5.5L V8 (M157)
2013 Mercedes-Benz G63 AMG 6x6 6x6 (W463) Twin Turbo 5.5L V8 (M157)
2019 Mercedes-Benz GLE63 AMG Base (W166) Twin Turbo 5.5L V8 (M157)
2019 Mercedes-Benz GLE63 AMG Coupe (C292) Twin Turbo 5.5L V8 (M157)
2018 Mercedes-Benz GLE63 AMG Base (W166) Twin Turbo 5.5L V8 (M157)
2018 Mercedes-Benz GLE63 AMG Coupe (C292) Twin Turbo 5.5L V8 (M157)
See more

Product Description

* Allow 2-4 weeks for orders to be shipped. Turbochargers are made to order.

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

M157 W.4 Turbochargers

Taking a giant leap ahead of all other available upgrades, the M157 W.4 Turbochargers completely replace the factory units. They are ball bearing, featuring CNC machined billet aluminum compressor wheels capable of flowing 6large amounts of air.

To feed these monster turbochargers, completely new intake tubes are included. Weistec Carbon airboxes are an optional upgrade. The Weistec Turbo-Folds provide significantly increased flow of exhaust gasses compared to the stock turbo-fold. The Weistec M157 True Downpipes perfectly mate up to the M157 W.4 Turbochargers to ensure minimal restriction once the exhaust gasses have gone through the turbine.

An Engineered Solution

The W.4 Turbochargers are the most capable production turbochargers available for the M157 engine. When all supporting upgrades are purchased, (supporting upgrades:M157 ASV/Water-Methanol Injection SystemWeistec True Downpipes and ECU tuning) the W.4 Turbocharger System for the M157is capable of producing 1000+ crank horsepower on 91 octane pump gas. What’s equally impressive is that these numbers are achieved at only 20psi, and 20 psi is only the beginning.

Inside Engine Bay View


Control = Reliability

While the M157 engine is a very robust engine in factory form, a couple of weak links have been found at extreme power levels. The most common is a bent connecting rod. If the engine is producing a sustained 1000 lb-ft of torque or more, all it takes is one knock event to bend a rod. This was taken into consideration with the ECU tuning for the W.4 Power Package as they can make far more power and torque than a stock M157 engine can handle. With our optional ECU Tune for the W.4 package, boost is controlled and tapered up to the peak of 20psi as RPM’s increase. This creates a broad torque curve that remains under 800 lb-ft (at the wheels) while allowing power to continually increase towards redline, minimizing stress on the rods as well as the rest of the drivetrain. With a fully built M157 and other supporting upgrades, expect to see significantly higher power numbers as the Turbochargers can flow enough air volume for 1400+ crank horsepower!

Key Features

  • Ball Bearing Turbochargers
  • Removed Restriction of Stock Turbo-Folds
  • Weistec M157 Turbo Intake Tubes and Optional Weistec Carbon Airboxes
  • Greatly Increased HP and Torque capability
  • CNC Billet Aluminum Compressor Wheel
  • Improved Airflow
  • Aggressive Exhaust Note
  • 1000+HP Capable
Turbo With Intakes

HP and TQ Graph

Additional Required Items For Peak Engine Performance:

  • High Flow Downpipe and Exhaust
  • Racing Spark Plugs
  • Weistec WMI/ASV
  • Weistec W.4 ECU Tune

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