RENNtech | ECU Upgrade | R172 | SLK 350 BlueEFFICIENCY | 308HP/285LB-FT | 3.5L V6 NaturallyAspirated | M276 sprinter-sprinter-van-2-1l-inline-4-diesel-esr3516206 5" Weight: Construction: 1-piece Forged

5" Weight:   Construction: 1-piece Forged Tire Size: 305/35-23

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

Stock: 567 HP | 502 LB-FT

W205 - C-Class Sedan C300 | MY2019+

The tasteful exterior enhancements begin at the rear with a prepreg carbon fiber decklid spoiler

RENNtech | ECU Upgrade | R172 | SLK 350 BlueEFFICIENCY | 308HP/285LB-FT | 3.5L V6 NaturallyAspirated | M276 sprinter-sprinter-van-2-1l-inline-4-diesel-esr3516206 5" Weight: Construction: 1-piece ForgedRENNtech 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