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By removing the factory exhaust resonator and reducing exhaust system back pressure
CLASS GL (X 164) 500 [2 Filters Required] (HP: 388 | Year: 06 >)
performance
626 LB-FT @2
COMMAND system up until Model Year 2020
R1 Performance Package for McLaren 650S alfa-romeo-stelvio-quadrifoglio--949---2018-2023--2-9-bi-turbo-v6-esr9101504 By removing the factory exhaustR1 Performance Package for the McLaren 650S. Includes RENNtech ECU Upgrade and Akrapovic Slip On Titanium Exhaust System. RENNtech has been at the forefront of ECU tuning since electronic engine management started to show up in vehicles during the mid 1980's! Our experience, countless hours of in house research, development and exhaustive testing ensure that our proprietary ECU upgrade offers incredible performance gains and rock solid daily driver
US$ 169.99
US$ 24.99
US$ 34.99
US$ 270.00