RENNtech ECU+ Upgrade | W212 | E 550 | 540HP / 705 LB-FT | 4.7L V8 BiTurbo | M278 | MY2012-2013 mclaren-slr-sls-class--197---2011-2014--amg-esr2440417 Stelvio Quadrifoglio (949)
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Ships within 48 hours · Estimated delivery Oct 15 - Oct 20
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RENNtech ECU+ Upgrade | W212 | E 550 | 540HP / 705 LB-FT | 4.7L V8 BiTurbo | M278 | MY2012-2013 mclaren-slr-sls-class--197---2011-2014--amg-esr2440417 Stelvio Quadrifoglio (949)ECU+ Upgrade 540HP 705LB FT +105HP +262LB 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. Programming takes only a few minutes and the vehicle can be reflashed at
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