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Im guessing the exhaust and manifold might free up a couple of hp but would get a proper live map to suit and wouldnt bother with the viper, ive never heard anything good about them tbh
If it isnt flashing because theres no fuel left id imagine that its either a stored fault or the fuel sensor is gone. Try holding in the stalk button and turning the car to ign and watch the dials dance, use the button to scroll through and see if any letters appear. Press the mileage reset...