RENNtech | ECU Upgrade | R172 | SLK 350 BlueEFFICIENCY | 308HP/285LB-FT | 3.5L V6 NaturallyAspirated | M276 sprinter-sprinter-van-2-1l-inline-4-diesel-esr3516206 ECU+ Upgrade | 523HP /

ECU+ Upgrade | 523HP / 583TQ | Gains: +102 HP / +128 TQ

W205 - C-Class Sedan C300 | MY2019+

C218 - CLS550 MY2015-2017 (FaceLift)

By modifying boost mapping and keeping optimized air-to-fuel ratios

RENNtech headers are constructed of the highest quality T-304 stainless steel and are ceramic coated to further reduce latent heat in the engine compartment as well as combat against thermal stress

RENNtech | ECU Upgrade | R172 | SLK 350 BlueEFFICIENCY | 308HP/285LB-FT | 3.5L V6 NaturallyAspirated | M276 sprinter-sprinter-van-2-1l-inline-4-diesel-esr3516206 ECU+ Upgrade | 523HP /RENNtech ECU Upgrade for 172 SLK 350 BlueEFFICIENCY. up to 308HP and 285LB FT. Gains: +6HP & +12LB 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