Compression Ignition Addict
Join Date: Feb 2007
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I did mine. You can notice a loud whistle on the intake side with the airbox off. With an aftermarket intake installed it is noticeable as well. Stock airbox silences it completely, and you can't tell a difference.
Keep in mind this makes the intake whistle louder, the '03 turbo has more whistle in the exhaust.
2010 F250 Lariat FX4 6.4l
Carli Backcountry 2.5", 11+ Leaf Springs, SCT 3015R/Tyrant Tuned, Edge Insight CTS,
FloPro DPF Pipe, RCD EGR Delete/Elbow, Sinister Coolant Filter, 11+ Console