RENNtech | ECU+ Upgrade | G550 4x4² | W463 | 523 HP / 583 LB-FT | 4.0L BiTurbo V8 | M176 mercedes-benz-cls-class--218---2011-2014--cls63-amg-biturbo-4matic-esr4755406 E450 (Airmatic Optional)
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Ships within 48 hours · Estimated delivery Aug 20 - Aug 25
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RENNtech | ECU+ Upgrade | G550 4x4² | W463 | 523 HP / 583 LB-FT | 4.0L BiTurbo V8 | M176 mercedes-benz-cls-class--218---2011-2014--cls63-amg-biturbo-4matic-esr4755406 E450 (Airmatic Optional)ECU+ Upgrade 523HP 582TQ Gains: +102HP +128TQ RENNtech tuning products are certified to meet CARB standards in all 50 States. 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
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