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 includes:
- RENNtech ECU Upgrade
- Stainless Steel Shorty Headers
S 550 (W221) Stock Performance:
- 382 HP / 391 LB-FT
- 413 HP / 422 LB-FT