I recently picked up a used diablosport predator for my 99 GT. After getting it unlocked and updated I hook it up only to find out there is already a tune on the car. What's the best course of action here? Sell the predator and move on or go and get a oem tune flashed into the ecu and then use the predator to tune. Or can I use an SCT flash tuner to overwrite the current setup and save it as backup. Let me guess, SCT won't overwrite non OE tuned either ha ha. I'm leaning towards the OEM reflash and go from there. Any advise?