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ENGINEERING THE FUTURE OF PERFORMANCE ™
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M157 Downpipes and Exhaust, G63
Purchase M157 Downpipes and Exhaust, G63
  • SKU: 01-157-00841-7

    M157 Downpipes and Exhaust, G63

  • 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.

  • $2,999.99

  • 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 760
Weistec Torque 852
Manufacturer Weistec
Street legal in all the US States No
Engine Family M157
Stock Horsepower 536
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year make model trim engine
2018 Mercedes-Benz G63 AMG Base (W463) Twin Turbo 5.5L V8 (M157)
2017 Mercedes-Benz G63 AMG Base (W463) Twin Turbo 5.5L V8 (M157)
2016 Mercedes-Benz G63 AMG Base (W463) Twin Turbo 5.5L V8 (M157)
2015 Mercedes-Benz G63 AMG Base (W463) Twin Turbo 5.5L V8 (M157)
2014 Mercedes-Benz G63 AMG 6x6 6x6 (W463) Twin Turbo 5.5L V8 (M157)
2014 Mercedes-Benz G63 AMG Base (W463) Twin Turbo 5.5L V8 (M157)
See more

Expect delivery times of 8 weeks


Weistec Engineering offers True Downpipes for M157 AMG and M278 powered vehicles. Replacing the small and restrictive factory downpipes delivers significant gains in power, throttle response, and exhaust tone.

Engineered and designed with the most sophisticated Computer Aided Design tools, excellent fitment and the highest performance possible are guaranteed. Each downpipe has a specially designed CNC machined turbo outlet flange, transitioning into a 3 inch pipe and low profile V-Band flanges to mate with our Midpipes.

Downpipes come standard with external Titanium Ceramic Coating and internal Copper Ceramic coating to keep heat inside the piping, helping improve exhaust velocity and reduce engine bay temperatures.

Branded Weistec stainless steel heat shields are also included to block rising heat from the exhaust manifold.

Our Biturbo Midpipes bolt to the Downpipes using a low profile V-Band flange and transition to the factory axle-back. Each Mid-pipe has stainless steel brackets for solid bolt-in fitment and is made of 3 inch stainless steel piping creating a very high flowing quality exhaust system.

Complete exhaust system includes Downpipes, Midpipes, Heat Shields, Gaskets, and Hardware.

 *Product may not be emissions compliant.  Check local laws prior to installation.


Key Features:

  • 100% mandrel bent and TIG welded

  • Constructed of low carbon 304 Stainless Steel

  • Stainless steel heat shields offer the Weistec look and function

  • Easy bolt-on installation

  • Improved exhaust note

  • Improved exhaust flow