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I had a chip from Superchips in my '98 F-150. While it was a nice gain and firmed up the tranny, I think that the K&N Air filter and Cat back exhaust did just as much to improve performance.
On the diesel trucks it is a totally different story. A $400 tuner makes a huge difference - to the tune of 100+ HP and 200+ lb*ft of torque. Dropped my 1/4 mile ET from 16.0 flat to 14.33 and improved my mileage while towing by 10%.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.