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The 99 turbo has a much smaller wastegated housing which will give you more boost in low RPM's but when you start adding more fuel the housing becomes too small and you will get high backpressure and higher EGT's. I also think the newer trucks have a different turbo mount pedistall. Not worth it for the work involved.
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.
