Compression Ignition Addict
Join Date: Oct 2011
Location: Chico, California
Thanked 227 Times in 218 Posts
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this is the sound of air going back out of the intake.
this is normal, you didnt hear it before because the stock intake is enclosed, but since its open you can hear it now.
99.5 f250 7.3 4x4 260k FF 160/30, PHP Hydra, S&B CAI, 4" Exhaust, RR Billet Wheel, Autometer Gauges, Transgo, Non-Ebpv Pedestal, High Flow Outlet, 08 Tow Mirrors.
Dad-2000 7.3 4x4 110k miles, Autometer Gauges, Superchips 1705, 6637, 4" Exhaust, BD Billet Wheel, TruCool Max