I have a ‘99 f150 5.4 2v with 332,000 miles. The only part on the truck that isn’t stock is the exhaust, which is true dual straight pipes. Had my fun with them, but it’s time for something new to wake the neighborhood up with on a cold winters morning. I was wondering what would be good aftermarket upgrades to do to gain more hp, torque, and possibly better fuel economy. I don’t intend on building a race truck, but I want a little more than I currently have. Regardless of the mileage, the engine runs very well. I change the oil every 3,000 miles and keep it well maintained. Any suggestions are well appreciated