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Hello! My name is Gary.Welcome to JustAnswer.Subaru want to charge you because of the aftermarket work on the car.
So if the tuner can't fix it for you, then you will need to put it back to stock.
Hence why Subaru wants 4 hours.
Do you need any further help?
I hope my advice has been of assistance to you.
Have you decided what to do with your problem?
What does the tuner say?