I have an '03 4.6L Expy with 44K miles on the clock; bone stock. This spring I am planning a few cosmetic mods but also want to give the 4.6 a little more grunt; looking for torque. I live in San Antonio and a local shop here that does a lot of Ford upgrades, mosty F150s, is pushing the Predator Delta Chip. What would you recommend? Is programming required? Is dyno tuning necessary? I am looking for a plugnplay chip, no dyno tuning, more low end and if mileage improves, great but that is secondary to more low end performance.