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$750 plus shipping. This is a DTE ChipTuner off of my 991.2 GTS. I purchased the car used and it was already installed. I wanted to bring the car back to stock. This is claimed to add 80 HP, 89 FT-LBS Torque and up to 15% fuel economy. New retails for $1500. Read more about it here: https://www.chiptuning.com/us/porsche/911-991-2011/3-0-carrera-gts-450ps-331kw-2981ccm/powercontrol.html