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 Our ECU tune offers the

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

Up to 670HP and 840 LB-FT  LB-FT

Performance Tests: Vehicle Upgrades 0-60mph 0-100mph 60-130mph 1/4 Mile ET Trap Speed W/S 213 - AMG E63 Stock w/o Launch Control

SLK (R 171) 300 [2 Filters Required] (HP: 231 | Year: 09 > 11)

SL (R230) 300 [2 Filters Required] (HP: 231 | Year: 09 >)

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 Our ECU tune offers theRENNtech 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.