I just purchased a used 2008 Impreza WRX from a dealer. The exhaust is louder than normal and the car seems pretty quick for stock. Is there any way to tell if the chip has been reflashed using a tuner such as COBB? I am unable to contact the original owner so I have no idea where to start tuning. I am going to put the car on a lift this week and check for exhaust mods or damage.