Weistec Horsepower | 950 |
Weistec Torque | 800 |
Turbo Type | W.4 (Complete Replacement) |
Manufacturer | Weistec |
Street legal in all the US States | No |
Engine Family | M177 |
See more |
year | make | model | trim | engine |
---|---|---|---|---|
2023 | Mercedes-Benz | C63 AMG S | Cabriolet (A205) | Twin Turbo 4L V8 (M177) |
2022 | Mercedes-Benz | C63 AMG S | Cabriolet (A205) | Twin Turbo 4L V8 (M177) |
2021 | Mercedes-Benz | C63 AMG S | Cabriolet (A205) | Twin Turbo 4L V8 (M177) |
2020 | Mercedes-Benz | C63 AMG S | Cabriolet (A205) | Twin Turbo 4L V8 (M177) |
2019 | Mercedes-Benz | C63 AMG S | Cabriolet (A205) | Twin Turbo 4L V8 (M177) |
2018 | Mercedes-Benz | C63 AMG S | Cabriolet (A205) | Twin Turbo 4L V8 (M177) |
See more |
Product Description

Comprehensive Turbo Upgrade
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
- Increased compressor air flow
- 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

Supporting Upgrades
To push past 900 horsepower with the W.4 turbo upgrade, supporting mods aren't optional. They're essential. Each component is engineered to work in sync with the W.4 system, ensuring maximum performance, reliability, and efficiency. While the turbo can run without most of them, you'll be leaving serious power on the table.

ECU tuning
(required)
This is most important supporting upgrade. Tuning your Engine Control Unit (ECU) is what brings all your performance upgrades together. It recalibrates the engine's
brain, optimizing fuel, boost, timing, and more to work seamlessly with your new performance upgrades.
Without it, the ECU will still try to run the engine like it's stock, which can limit power, cause drivability issues, or even damage components.
ECU tuning can be done by your local trusted tuner or you can contact us
to see available tuning options.
Weistec CPC Module
(required for newer models)
The Computer Powertrain Control (CPC) Module can found in modern Mercedes vehicles. It is home to several torque limiters that used to be solely in the ECU.
The Weistec CPC module is a complete replacement for the factory CPC module and it removes all torque limiters, allowing the engine to produce maximum power without restrictions.
In general, 2019+ Mercedes vehicles have the CPC module, but some older models with the 9G-Tronic transmission may also have it. Please contact
tuning@weistec.com to confirm if your vehicle has a CPC module.
See Product


Downpipes*
(required)
Our downpipes are designed to increase exhaust flow, reduce back pressure, and improve turbo spool time. This results in increased horsepower and torque.
High flow cats may be also be used instead of downpipes, but they will not provide the same level of performance as downpipes.
See GLC63 Downpipes
See C63 Downpipes
Performance Spark Plugs
(Highly Recommended)
Higher boost means more heat. Performance spark plugs dissipate heat more efficiently. This means better cooling and improved knock
resistance!
See Product


Water-Methanol Injection System
(Higly Recommended)
High performance engines run extremely hot. Water-Methanol Injection Systems provide cooling and boosts octane. All this combined leads to
increased performance and knock resistance.
See Product
Carbon Fiber Airboxes
(Recommended)
More air flow. More Power! Our Carbon Airboxes increase filter surface area by 225% over OEM and are purpose-built to complement the W.4
turbo upgrade, maximizing intake efficiency.
See Product


Forged Pistons and Billet Rods
(Recommended)
Built from stronger materials than OEM, our forged pistons and billet rods are engineered to handle increased power and high boost
ensuring greater engine strength, reliability, and safety under extreme conditions.
See Product
TCU tuning
(Recommended)
While this upgrade doesn't add any horsepower to your vehicle, it does make sure that your vehicles puts it down to the pavement as efficiently and
aggressively as possible. Our Transmission Control Unit (TCU) tuning increases line pressure resulting in faster shifts, reduced slipping and increased torque capacity.
See 7 speed TCU Tuning
See 9 speed TCU Tuning

*Weistec Downpipes are not for sale in the United States.