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you won't see the 5.0 listed, but it can be done, you just have to supply them with the computer code, 4 digitd, 3 letters and and a number, like OLD2. YOu can find the code on the trucks computer which is in the engine compartments, the code should be pretty easily visable.
THe diablo chip is the way to go. Expect 8-10% HP increase and 10-15% torque increase.