RENNtech HHT-Hand Held Tuner | ECU Upgrade | R199 | SLR McLaren | 675 HP / 646 LB-FT | M155 | 5.5L V8 Supercharged ferrari-458--2009-2015--esr3806621 the #RENNtech HSM Screen will

the #RENNtech HSM Screen will appear on the Mercedes Command screen

improve safety

RENNtech Carbon Fiber Airbox for M156 - 63 AMG Engines

RENNtech was able to significantly increase the area under the curve

Any parts with more noticeable areas of concern are scrapped entirely and never offered to our highly discerning clientele

RENNtech HHT-Hand Held Tuner | ECU Upgrade | R199 | SLR McLaren | 675 HP / 646 LB-FT | M155 | 5.5L V8 Supercharged ferrari-458--2009-2015--esr3806621 the #RENNtech HSM Screen willThe RENNtech ECU Plus Upgrade brings the SLR McLaren up to 675 HP and 646 LB FT Gains: +47 HP and +25 LB FT. RENNtech HHT (hand held tuner) allows you the unlimited ability to switch between tuned and stock ECU programming and requires no ECU removal! Our proprietary tuning module stores both the RENNtech tuned file and your vehicles stock file. The module plugs directly into the OBD2 port and delivers the file you choose directly to the ECU.