Lifetime Supporting Member
Join Date: Nov 2003
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You can hear mine do that too. In my case it is the turbo spooling down and it is accompanied by a faint whistle. I kinda like it, sounds a little like a big rig. Not sure but it may have got louder after I removed the insulation from the CAC tube.
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Brian, Tucson, Arizona
02 F350 4x4 CREW 7.3 170K, BFG Rugged Terrain 285s, AIS, Isspro pyro, boost & tranny temp pillar pod, Dipricol coolant temp, ELC, Isspro EV-2 Fuel Pressure & HPOP, Dieselsite boots, coolant & tranny filters & 203* Stat, 6.0 Tranny Cooler, ITP pre pump tank mod, Bellowed Up Pipes, Riffraff Frx, netbook mount with AE, GPR LED, Stancor, Red Head steering gear, Battery Tender & 2 Marincos.