R1 Performance Package for S 550 (W221- 413 HP / 422 LB-FT) mercedes-benz-c-class--217---2014-2020--s63-amg-esr5011825 Exhaust Valve Module (EVM)

Exhaust Valve Module (EVM)

The Performance Series is the culmination of this extensive knowledge

RENNtech HHT - Hand Held Tuner ECU Upgrade

Modified Performance

- Independently adjustable damping technology - rebound and compression damping

R1 Performance Package for S 550 (W221- 413 HP / 422 LB-FT) mercedes-benz-c-class--217---2014-2020--s63-amg-esr5011825 Exhaust Valve Module (EVM)R1 Performance Package for 221 S 550. Includes ECU Upgrade and Stainless Steel Header. Up to 413HP and 422 LB FT. Gains: +31HP & +31 LB FT The R1 performance package for the Mercedes 550 includes our proprietary ECU upgrade in addition to our stainless steel shorty headers designed specifically for the 550 V8 for a combination that provides increased performance, sound and throttle response across the vehicles entire powerband. R1 performance package