R1 Performance Package | W211 | E 55K | 538 HP / 566 LB-FT | 5.5 Supercharged V8 | M113 ferrari-612--2004-2011--esr6569405 With the RENNtech ECU Plus

With the RENNtech ECU Plus Upgrade the R199 - SLR McLaren gains up to +47 HP and +25 LB-FT

Cutting instructions and template supplied by RENNtech

The module must stay plugged in for data logging

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

RENNtech tuning software for McLaren offers significant gains in horsepower and torque across the vehicles entire power band

R1 Performance Package | W211 | E 55K | 538 HP / 566 LB-FT | 5.5 Supercharged V8 | M113 ferrari-612--2004-2011--esr6569405 With the RENNtech ECU PlusR1 Performance Package for 211 E 55 AMG Kompressor. Includes ECU Upgrade, Crankshaft Pulley and Upgraded Intercooler Pump. Up to 538HP and 566LB FT. Gains: +69HP & +50LB 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: RENNtech