RENNtech ECU Hand Held Tuner | HHT | S 63 AMG | W221 | 534HP/485 LB-FT | 6.3L N/A | M156 | MY2008-2010 audi-rs7--4g---2013-2017--4-0l-v8-tfsi-esr8517887 Up to 670HP and 840

Up to 670HP and 840 LB-FT  LB-FT

85 mph W213 - E63 AMG S Sedan Rt ECU Upgrade w/Launch Control 2

079) [Needs 2 Filters] (HP: 612 | Year: 05 >)62 (W240) 5

S550 (W222 | MY2014-2017 | 4MATIC | M278 | 4

Our ECU tune offers the biggest performance gains on the market with our dyno results increasing performance from 329 HP and 354 lb/ft torque

RENNtech ECU Hand Held Tuner | HHT | S 63 AMG | W221 | 534HP/485 LB-FT | 6.3L N/A | M156 | MY2008-2010 audi-rs7--4g---2013-2017--4-0l-v8-tfsi-esr8517887 Up to 670HP and 840RENNtech ECU HHT (HandHeldTuner) for the 221 S 63 AMG. Up to 534HP and 485LB FT LB FT. Gains: +16HP & +20 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.