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I have had the factory replacement from K&N before changing to the AFE stage 2... It’s a big difference both in power and the ability to breathe easier. Your mpg also is affected by the upgrade for the better.
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'03  7.3
AFE stage 2 intake
Banks 4" turbo back exhaust
Banks 6 gun diesel tuner
Banks Big Hoss Module- Level 5 Tune
Banks Big Head wastegate
Banks TransCommand
CFM intake heater delete kit
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