The Mercedes GT-S is the second Mercedes Benz vehicle fully developed by AMG, the company’s Affalterbach based performance division and long fabled engine builder. The resulting vehicle is nothing short of spectacular and the 4.0L V8 BiTurbo engine within is an incredible platform to build performance upon. 

RENNtech lightweight forged billet turbo 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 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 additional 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 gaining up to 180 hp and 161 lb-ft.

More power isn’t the only performance benefit as our 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, our turbo upgrade kit functions with the OEM oil and coolant lines. This isn’t just an OEM turbo charger with machined internals; but a dramatically larger, more powerful turbocharger that blows away anything else on the market!

The RENNtech performance turbo upgrade is truly the ultimate upgrade for your AMG GT-S.

Key Features:

• The RENNtech Stage I Turbo Upgrade comes with an RENNtech ECU Upgrade and the RENNtech Blow-Off Valve Adapters
• 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
• Up to 716 HP and 656 TQ @ crank

Notes:

• This Turbo Upgrade requires an additional core charge, which will be credited upon return of OEM turbo core to RENNtech
• We have found the new M178 engine stock performance numbers vary from the baseline figures claimed by Mercedes Benz. We typically see higher baseline numbers than claimed by the factory. Numbers will be dependent on conditions and fuel quality.
• Power gains are calculated with stock numbers measured by RENNtech
• To reach the maximum power level, RENNtech downpipes, BOV adapter and high-flow air filters are required.
• Our numbers will be dependend on conditions and fuel quality.

AMG GT-S (C190 | M178 | 4.0L V8 BiTurbo) Stock Performance:

• Rated by Mercedes-Benz:        503 HP @ 6,250 RPM; 479 LB-FT @ 1,750-4,750 RPM
• Rated by RENNtech:                536 HP @ 6,250 RPM; 495 LB-FT @ 3,850-5,400 RPM
• Mercedes M178 engine performance when measured, obtains higher power numbers than rated from factory.

AMG GT-S (C190 | M178 | 4.0L V8 BiTurbo) Performance:

• 716 HP @ 6,250 RPM; 656 LB-FT @ 4,500-5,500 RPM