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 Our kit comes complete with

Our kit comes complete with high flow performance filter inserts and anodized aluminum MAF sensor retaining clips

502 LB-FT @ 1

Dyno measured by RENNtech (peak @crank):          339 HP @ 5

GTS Coupe (MY2021+)

CLK COUPE' (C 209) 350 [2 Filters Required] (HP: 272 | Year: 05 > 09)

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 Our kit comes complete withThe 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.