Compression Ignition Addict
Join Date: Jan 2008
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Completely different vehicle but -
On a semi I had I developed a crack in an exhaust manifold , when building boost and pulling hills that crack created a LOUD whistle , embarrassingly loud ! Not saying it's your problem but definitely sounds as if you have a large volume of air escaping through a small something to create the whistle effect.
Sold 01 350 6" on 37's and mild mods, 00 X 4" on 35's, 02 f350 4" 35's molded from fan to drive shaft, ridin the 03 with nose conversion with 125k and counting upwards slowly.
Never had CNC on any of it, never will.
Take 3/4 of the info and recommendations on here with a grain of salt