RENNtech HHT-Hand Held Tuner | ECU Upgrade | R199 | SLR McLaren | 675 HP / 646 LB-FT | M155 | 5.5L V8 Supercharged mercedes-benz-slk-class--172---2011-2020--slk-350-esr9893956 bolt on component which improves

bolt on component which improves vehicle aesthetics and increases front end down force

All RENNtech Track Series wheels are sold with a lifetime structural warranty so you can be confident that you are using a high-performance wheel with factory backing

8 Turbo S [2 Filters Required] (HP: 500/540/550 | Year: 07 > 10)

Optional features for additional cost

0 L BiTurbo w/ EQ Boost | M177 | 725 HP & 765 LB-FT

RENNtech HHT-Hand Held Tuner | ECU Upgrade | R199 | SLR McLaren | 675 HP / 646 LB-FT | M155 | 5.5L V8 Supercharged mercedes-benz-slk-class--172---2011-2020--slk-350-esr9893956 bolt on component which improvesThe 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.