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MuchBoost RNC-RS Upgraded Turbocharger with a Custom Billet Compressor Wheel and High-Flow 9 Blades Turbine Wheel. It is based on an original KKK Turbocharger, which means that the installation is 100%P&P. The turbocharger is meant to work with Ford Focus RS MK2 with the RNC-RS 305HP engines.

The turbo delivers up to 167% power (185 extra HP) over the factory specs. It is a great choice for someone looking for a bit extra HP from their daily driver. MuchBoost turbo allows you to get more from your engine and enjoy it even more than you’ve been so far.

Main Features
  • The potential 490HP,
  • Fast spool thanks to Custom Billet Compressor Wheel,
  • High-Flow 9 Blades Turbine Wheel,
  • High air-fuel ratio including high peak torque achieved at low engine speeds.
Details on the construction of the turbo:
  • Precisely Machined KKK seal plate, compressor and turbine housing,
  • Genuine KKK exhaust manifold,
  • Genuine KKK bearing housing,
  • Reinforced actuator,
  • Upgraded Journal bearing system that allows holding more boost,
  • Dynamically balanced,
  • The compressor and turbine wheels are balanced separately, and then the whole core is high-speed balanced using VSR balancing machines at speeds similar to the level seen in the vehicle.
Other significant modifications

The turbo is meant to work with ~490HP In order to reach that level of power, you need to adjust your fuel, exhaust, and cooling systems as well.

You might also consider

RNC-RS De-Cat Downpipe 2,5″-3,0″ KIT Ford Focus II RS 2.5T

A set of gaskets is included with the turbo!

Ford Focus RS MK2 2.5T 305HP

Factory numbers

5316 998 0010
5316 970 0010
5316 988 0010



OEM number


(If your engine has a different code, please send us a message. We will verify it.)

Matters you should be aware of when placing your order.
    1. The warranty is 12 months without the limit of mileage.
    2. We need about 7 working days to perform and ship the upgraded turbocharger. The parcels in European Union are shipped via DPD for just 25,00 EURO. DHL Express (airplane shipping)  is used for orders besides the EU, it costs 99,00 EURO. The average delivery time is 2-4 working days. 
    3. Every parcel is fully insured.
    4. If you didn`t find the turbo you need, feel free to contact us. We are able to perform many more upgraded turbochargers than you can find on the site. Our development department works permanently on the new models.
    5. Do you have a workshop, are you an influencer or seller of tuning parts? We are open to cooperation by offering discounts and refunds.
    6. During placing your order, please provide information as follows:
    • the engine code,
    • the car model,
    • the stock power,
    • the VIN number

These details are helpful to make the turbo correctly.



1 Review

This turbo is performing extremely well on the focus MK2. I bought this as an upgrade for my focus ST and I’m very happy with the result. Spool is very fast and the turbo keeps pushing in all the engine’s rev range. This is awesome. Muchboost is doing a meticulous job as always.

Rudy GRONDINon 13 August 2022
Customer Reviews

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