R1 Performance Package | W220 | S 55K | 538 HP / 566 LB-FT | 5.5L Supercharged V8 | M113 land-rover-lr4--l319---2010-2016--5-0-l-v8-esr1028371 Rated by Mercedes-Benz: 537 HP

Rated by Mercedes-Benz:      537 HP @ 5

With the newest update of their Software Upgrade for the M278 – 4

Rated by Mercedes-Benz:        449 HP @ 5

No need for a coaster

ECU Upgrade | 480HP/ 605LB-FT | Gains: +45HP / +162LB-FT

R1 Performance Package | W220 | S 55K | 538 HP / 566 LB-FT | 5.5L Supercharged V8 | M113 land-rover-lr4--l319---2010-2016--5-0-l-v8-esr1028371 Rated by Mercedes-Benz: 537 HPR1 Performance Package for 220 S 55 AMG Kompressor. Includes ECU Upgrade, Crankshaft Pulley and Upgraded Intercooler Pump. Up to 538HP and 566 LB FT. Gains: +45HP & +48 LB FT Performance package R1 includes our proprietary HHT Hand Held Tuner ECU Upgrade and crankshaft pulley in addition to our higher efficiency intercooler pump for increased, power, performance and throttle response across the entire powerband. R1 Performance Package includes: