RENNtech HHT-Hand Held Tuner | ECU Upgrade | R199 | SLR McLaren | 675 HP / 646 LB-FT | M155 | 5.5L V8 Supercharged porsche-911--991-1---2011-2016--carrera-esr5903692 15 sec 127 mph X290

15 sec 127 mph X290 - AMG GT63 R1 & R2 Package w/Launch Control 2

502 LB-FT @ 1

GTS Coupe (MY2021+)

Up to 380HP and 395 LB-FT LB-FT

RENNtech HHT-Hand Held Tuner | ECU Upgrade | R199 | SLR McLaren | 675 HP / 646 LB-FT | M155 | 5.5L V8 Supercharged porsche-911--991-1---2011-2016--carrera-esr5903692 15 sec 127 mph X290The 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.