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 2 or 16 Finish: Brushed

2 or 16 Finish: Brushed Aluminum

Price Per Set (x2 Filters)

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

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

5" Weight: 22

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 2 or 16 Finish: BrushedRENNtech 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