Compression Ignition Addict
Join Date: Sep 2012
Location: Knoxville TN
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the loud "rushing air" or "vacuum" sound is perfectly normal. the vanes on the VGT close at cold start to increase back pressure and warm the engine up faster. with the factory exhaust its there, just not as pronounced as a straight piped truck. when your at operating temp, you'll just get the turbo whistle at idle.
the VGT, or Variable Geometry Turbocharger, is what gives the 6.0 its signature "jet engine" sound, where the 7.3 kinda has that helicopter, chopping air sound. the nice thing about VGT, is almost instant boost off idle, providing excellent pulling power and practically no lag. hell, my truck makes anywhere from .50-.70psi at idle.
-Tyler- -Navistar Technician-
2004 F250 CCSB FX4 6.0 - XDP EGR delete, BPD Oil Cooler Relocation, SCT Livewire TS, 315/75/16 Falken Wildpeak A/T's, Rough Country 4in, stock DP with 4in straight pipe.
Last edited by Int.Tech04; 11-11-2012 at 06:33 AM.