Mercedes S63 AMG Biturbo (2007-2013) – RENNtech Stage 2 Turbo Upgrade Package





Mercedes made the latest generation of M157 biturbo engines seriously fast right out of the box. Challenge accepted…….

RENNtech took the latest generation of M157 biturbo engines and spent months testing and developing their line of performance turbos.

They start with a set of motorsport derived ball bearing turbochargers from Garrett, one of the most respected turbo manufactures in the industry whose products offer rugged service life and OEM daily driver reliability. Using this platform as a foundation, they put in a lot of work to adapt these turbos to their specific application.

The lightweight forged billet wheels feature a dramatically larger than stock impeller (inlet side) and an increase in the turbine trim (exhaust side). This combination of high quality, light weight components coupled with less rolling resistance from the ball bearing cartridge compensates for turbo lag despite being a functionally larger turbo. The cartridge supporting shaft is also both larger and stronger designed to handle the larger wheels and added power. This entire cartridge is then fine balanced as a complete assembly to compensate for these increases. The impeller and turbine housings are then precision CNC machined and flow tested in-house to fit the larger internal cartridge. The end result is nothing short of spectacular with the RENNtech turbo package making an incredible 855 HP and 945 TQ at the crank!

More power isn’t the only performance benefit as their turbos spool quicker, offer a more responsive throttle and immediate power delivery thanks to a reduction in exhaust back pressure, rolling resistance, higher RPM’s and a lighter rotating mass. In addition, their turbo upgrade kit includes new high quality lines and fittings wrapped in heat resistant sleeves with every detailed piece manufactured and tested in-house to ensure years of 100% trouble-free and leak proof operation. These lines are made specifically to adapt to our turbos as this isn’t just an OEM unit with machined internals; but a dramatically larger, more powerful turbocharger that blows away anything else on the market!

The RENNtech’s performance turbo upgrade is truly the ultimate upgrade for your 63 series M157 biturbo!

Key Features:

  • The RENNtech Stage II Turbo Upgrade comes with an ECU Tune and performance diverter valve
  • RENNtech Ball Bearing Garrett derived turbo chargers
  • Larger impeller (inlet) and turbine (exhaust) cartridge
  • Cartridge shaft is larger and stronger to support larger wheels
  • Entire cartridge is fine balanced as an assembly
  • Lightweight forged billet wheels
  • Less rolling resistance offers quicker spooling
  • Virtually no lag with impressive throttle response
  • Precision machined impeller and turbine housings
  • Leak proof, high quality lines and fittings with heat shielding
  • 855 Hp and 945 TQ @ crank



  • Note: We have found the new M157 engine stock performance numbers vary from the baseline figures claimed by Mercedes Benz. We typically see slightly higher baseline numbers than claimed by the factory.
  • Our numbers will be dependend on conditions and fuel quality.
  • In addition we recommend the RENNtech downpipe and charge cooler pump upgrade.


M157 Stock Performance (Without Performance Package):

  • 518 HP @ 5500 RPM; 516 LB-FT @ 4800 RPM

Modified Performance (Without Performance Package):

  • 855 HP @ 5500 RPM; 945 LB-FT @ 3800 RPM


M157 Stock Performance (With Performance Package):

  • 550 HP @ 5500 RPM; 590 LB-FT @ 4800 RPM

Modified Performance (With Performance Package):

  • 855 HP @ 5500 RPM; 945 LB-FT @ 3800 RPM


*NOTE This turbocharger upgrade is supplied on a exchange basis and you will be refunded £2400 once your old turbo’s get returned to us


Due to some of the products coming direct from RENNtech USA please allow 7-10 days for delivery

Prices may vary in accordance to the current exchange rate, please contact us for the current confirmed price

Our refunds policy can be found here