By far the #1 first modification for your Ford F150 is one of our custom Brenspeed tuned X3's. Our custom tunes will give you the fastest throttle response possible, increased HP, the maximum torque possible at lower RPM’s, and often improved MPG. Brenspeed’s custom tunes are a far cry from your basic aftermarket tune. We have years of experience and R&D invested into our tunes to give you more benefits than just a peak HP gain on the dyno.