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thought it was the dual mass flywheel starting to let loose on me but i have this high pitched pulsating drone that is always present at idle. i was under the truck listening the other day, even busted out the mechanics stethoscope and i swear its coming from the exhaust. sounds loud in the cat, could it be getting clogged up? can't hear it once im driving just at idle.
 

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Are you stock or modified anywhere on the exhaust turbo back?
 
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