RENNtech ECU Upgrade for GLK 350 (X204- 290 HP / 278 LB-FT) porsche-cayenne--9ya---2018-present--cayenne-gts-coupe--my2020---esr2231938 R1 Performance Package for the

R1 Performance Package for the Bentley Continental GT Speed

Up to 413HP and 422  LB-FT

Our intermediate level ECU upgrade offers huge gains in performance across the entire RPM range without sacrificing around town comfort or daily driver reliability

218 - CLS 63 AMG (FaceLift MY 2015 up / non 4-MATIC)

dB  81 at 3750 rpm  83 at 3750 rpm + 2

RENNtech ECU Upgrade for GLK 350 (X204- 290 HP / 278 LB-FT) porsche-cayenne--9ya---2018-present--cayenne-gts-coupe--my2020---esr2231938 R1 Performance Package for theRENNtech ECU Upgrade for 204 GLK 350. Up to 290HP and 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