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W.4 Turbo Upgrade System, BMW S63
Purchase W.4 Turbo Upgrade System, BMW S63
  • SKU: 01-563-01810-5

    W.4 Turbo Upgrade System, BMW S63

  • 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.

  • $12,999.00 $12,999.00

  • 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 1000
Weistec Torque 900
Turbo Type W.4 (Complete Replacement)
Manufacturer Weistec
Street legal in all the US States No
Engine Family S63tu
See more
year make model trim engine
2017 BMW M6-Series Gran Coupe 7AT (F14) Twin Turbo 4.4L V8 (S63)
2016 BMW M6-Series Gran Coupe 7AT (F14) Twin Turbo 4.4L V8 (S63)
2015 BMW M6-Series Gran Coupe 7AT (F14) Twin Turbo 4.4L V8 (S63)
2014 BMW M6-Series Gran Coupe 7AT (F14) Twin Turbo 4.4L V8 (S63)
2013 BMW M6-Series Gran Coupe 7AT (F14) Twin Turbo 4.4L V8 (S63)
2017 BMW M6-Series Gran Coupe 6MT (F14) Twin Turbo 4.4L V8 (S63)
See more

Product Description

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

* 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. **Core Required


BMW S63 W.4 Turbocharger Upgrade

The BMW S63 W.4 Turbochargers are complete, bolt-on replacements for the stock turbochargers. There are no core charges with these turbos. No need to send in your stock turbos to get modified while your car sits in pieces waiting for the turbos to get back. Simply install the Weistec W.4 Turbochargers when you receive them. All necessary hardware is included. New turbo inlet pipes that mate up to the factory airboxes(or any bolt-on aftermarket intake), and new charge pipes with integrated methanol injection ports that connect the turbos to the factory intercoolers come standard with the S63 W.4 Turbochargers. A pair of Weistec 304SS downpipes are also included to connect the turbos to the rest of the exhaust without any cutting or welding as downpipes that are for the stock turbos will no longer fit the vehicle. Stainless braided oil and coolant lines are included with custom CNC machined and anodized fittings. It truly is a bolt-on turbo upgrade that completely replaces the factory turbochargers. Even the factory engine cover still fits over the turbos.

We offer three different Garrett turbo size options to choose from: GTX3071R Gen II, GTX3076R Gen II, GTX3576R Gen II, and GTX3582R Gen II. This gives choices that range from reasonable response and mid-range to all-out monster top-end power!

In addition to turbo size options, we also offer a Water/Methanol Injection System and Weistec Anti Surge Valves as upgrades to the W.4 Turbochargers. Couple all these upgrades with a custom tune and you have the recipe for serious power.

An Engineered Solution

The goal of the W.4 Turbocharger Upgrade was to offer bolt-on full replacment turbochargers that fit with out the need for any custom fabrication or permanent modification to the engine or chassis. Something that will let you take your M5/M6 to unreal power levels. The W.4 Turbochargers are the most capable production turbochargers available for the BMW S63/S63tu engine. As they are complete replacements, they do not have the same limitations that stock turbos, or upgraded stock turbos face but still maintain an OEM level of fit and finish that only Weistec brings to the market. This isn't a pair of universal turbos fitted to the car with a lot of cutting and welding. Its an upgrade that can be installed in a day's worth of work with typical mechanic's tools.


Key Features

  • Choice of Garrett Gen 2 GTX3071R, GTX3076R, GTX3576R, or GTX3582R Turbos
  • .75 A/R Turbine Housing
  • .70 A/R Compressor Cover
  • No core charge / exchange
  • Ball Bearing Turbochargers
  • High flowing Weistec Stainless Steel turbine housings
  • Weistec Turbo Intake Tubes and Charge Pipes
  • Weistec 304SS Downpipes (OEM style downpipes are incompatible)
  • All OEM heat shields are retained
  • Retains factory wastegate actuators
  • Bolt in Installation
  • Stainless Braided Oil and Coolant Lines
  • CNC Machined Anodized Coolant and Oil Fittings
  • Custom Tuning Required

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