RENNtech ECU Upgrade GL 450 (X166- 501 HP / 576 LB-FT for M278 Biturbo) mclaren-mp4-12c--2011-2014--v8-biturbo-esr2887833 GL 350 BlueTec (X164) Stock

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RENNtech ECU Upgrade GL 450 (X166- 501 HP / 576 LB-FT for M278 Biturbo) mclaren-mp4-12c--2011-2014--v8-biturbo-esr2887833 GL 350 BlueTec (X164) StockRENNtech ECU Upgrade for 166 GL 450 BiTurbo. Up to 501HP and 576LB FT. Gains: +139HP & +170LB 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

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