RENNtech ECU Upgrade for C 350 | W204 | 290 HP / 278 LB-FT | MY2008-2011 mercedes-benz-sl-class--230---2007-2011--sl65-amg-black-series-esr3902223 the RENNtech BOV adapters create

the RENNtech BOV adapters create the on turbo-charged engines well-known "blow-off" sound

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

Our transmission upgrade consists of a complete transmission disassembly and inspection as well as a mechanical upgrade to the transmission clutch packs

CLASS S (W 220) 500 V8 4-matic [5 gear] [2 Filters Required] (HP: 306 | Year: 98 > 03)

CLASS S (W 221) 500 Blue Efficiency [2 Filters Required] (HP: 435 | Year: 11 > )

RENNtech ECU Upgrade for C 350 | W204 | 290 HP / 278 LB-FT | MY2008-2011 mercedes-benz-sl-class--230---2007-2011--sl65-amg-black-series-esr3902223 the RENNtech BOV adapters createRENNtech ECU Upgrade for 203 C 350. up to 290HP, 278LB FT. Gains: +22HP & 20LB FT 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 reliability. RENNtech tuning software for