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 structural laminates with controllable and

structural laminates with controllable and predictable results

Rated by RENNtech (peak @wheel):              665 whp @ 5

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

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

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 structural laminates with controllable andThe 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.