Hello everyone. I recently bought an '08 GT from a dealer. It has a Ford Racing intake and from what I've learned, this intake requires a tune. I don't believe the vehicle has a tune on it. I have been getting horrible gas mileage, and also knocking at very low and very high rpm. I'm assuming that this is because the computer isn't adjusted for the intake. If anyone can give me any information here it would be greatly appreciated.
