RENNtech | ECU Upgrade | R172 | SLK 350 BlueEFFICIENCY | 308HP/285LB-FT | 3.5L V6 NaturallyAspirated | M276 audi-rs7--c8---2019-present--4-0l-v8-tfsi-esr3673228 Prepreg is widely known as

Prepreg is widely known as the finest process in carbon fiber manufacturing and has been used for aerospace and military applications because of its superior consistency in weight

RENNtech SLR package 2 contains our proprietary ECU

448 awhp @ 5

831 LB-FT @ 6

332 LB-FT @ 3000-4600 RPM

RENNtech | ECU Upgrade | R172 | SLK 350 BlueEFFICIENCY | 308HP/285LB-FT | 3.5L V6 NaturallyAspirated | M276 audi-rs7--c8---2019-present--4-0l-v8-tfsi-esr3673228 Prepreg is widely known asRENNtech 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