R1 Performance Package | R171 | SLK 55 AMG | 385 HP / 400 LB-FT | 5.5L NA V8 | M113 bmw-m4--f82-f83---2014-2020--3-0-liter-twin-turbocharged-inline-6-esr1854239 ECU+ Upgrade | Up to

ECU+ Upgrade | Up to 584 HP / 642 LB-FT | Gains: up to +100 HP & +102 LB-FT

These shocks are specifically developed by RENNtech to improve the On and Off Road handling and performance of the G-Class(MY 1990 – 2018)

in order to create a smooth finish

drivers can use the Sound Remote Controller or the new smartphone app (for iOS and Android) to regulate the valves

R1 Performance Package | R171 | SLK 55 AMG | 385 HP / 400 LB-FT | 5.5L NA V8 | M113 bmw-m4--f82-f83---2014-2020--3-0-liter-twin-turbocharged-inline-6-esr1854239 ECU+ Upgrade | Up toR1 Performance Package for 171 SLK 55 AMG. Includes ECU Upgrade and Carbon Fiber Air Box. Up to 385HP and 400 LB FT. Gains: +30HP & +24LB FT The R1 performance package for the Mercedes 55 series engine includes our proprietary ECU upgrade in addition to our full carbon fiber airbox upgrade which offers a larger volume of incoming air for better engine breathing and improved cylinder filling. This combination that provides noticeable increases