R1 Performance Package for SL500S | M113 | R129 | +23HP / +16LB-FT | MY 1999-2002R1 Performance Package for M113 Powered R129 SL500S. Includes ECU Upgrade and Carbon Fiber Air Box. Up to 23HP 26LB FT The R1 performance package for the Mercedes 500 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 horsepower, torque and
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R1 Performance Package for SL500S | M113 | R129 | +23HP / +16LB-FT | MY 1999-2002