Hey fellas, my 98 mustang still runs great even at 113k. my question is: is it worth it to do an upgrade like the PI head swap and headers with this kind of mileage. I was thinking about dyno testing it before to see if there has already been any significant power loss. Also, perhaps a compression test to see the status of the motor. Anything else i should look into before dumping some money into the motor. The motor runs great, starts all the time, doesn't burn any oil or anything. Its about the only piece of the car that has never had any issues. Your insights would be appreciated. Thanks!