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.
Take 3/4 of the info and recommendations on here with a grain of salt
Never had CNC's junk on any of it, never will.