The best solution for getting the most out of any aftermarket performance upgrades you've made to your 1997-2003 4.6L or 5.4L F150 is to load up a custom tune. These powerful tunes send a message to your truck's Powertrain Control Module (PCM), changing the settings from factory stock to match any new upgrades you've made (increased tire size, cold air intake, performance exhaust, etc.). The new custom tuning sends a message to your on-board computer with any aftermarket upgrades you've added in order to maximize your F150s powerful potential. Many of our performance tuners also function as dashboard monitors that can display a wide range of gauges to allow you to monitor your trucks vital operating conditions. While the standard "canned" tunes on these devices are good, grabbing an SCT device with a custom tune from our friends over at 5-Star Tuning is a much better option if you're looking to squeeze every last bit of horsepower out of your 4.6L or 5.4L Triton engine. Best of all, using 5-Star's custom tuning instantly qualifies you for our Lifetime Tunes Program where you can receive free re-tunes for the life of your truck on products that you purchase from us here at Stage 3! Our free re-tunes let you build your truck up at your own pace without needing to pay each time for new tuning whenever you've made a new modification! After you're through with our tuners, take a look at our F150 4.6L or 5.4L cold air intakes and our F150 exhaust kits.