RENNtech | ECU Upgrade | R230 | SL 600 | MY07-11 | 625 HP / 745 LB-FT | 5.5L V12 BiTurbo | M275 porsche-cayenne--2017-present--po536--340ps--esr7220361 Rated by Mercedes-Benz: 515 HP

Rated by Mercedes-Benz:      515 HP @ 6

Audi S8 (D3/4E)

CLS (C 218) 550 [2 Filters Required] (HP: 406 | Year: 10 > )

RENNtech's valved sport mufflers utilize OEM electronic actuators for seamless operation and integration

adding a deep resonant sporty sound without droning

RENNtech | ECU Upgrade | R230 | SL 600 | MY07-11 | 625 HP / 745 LB-FT | 5.5L V12 BiTurbo | M275 porsche-cayenne--2017-present--po536--340ps--esr7220361 Rated by Mercedes-Benz: 515 HPRENNtech ECU Upgrade for 230 SL 600 MY 2007+. Up to 625 HP and 745 LB FT. Gains: +115 HP & +133 LB 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