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Re: 1999 Dodge Ram 5.9 Diesel Whistle under acceleration- not a turbo whistle.
Have you removed the silencer ring off the turbo or changed the air filter lately/not changed the air filter in a long time?
Have you installed a lift pump fuel pressure gauge?
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1992 Bravada, 201K, stock
1997 Bravada, 101K, stock...was "called away" 
"Cornbread Red", 2001 Dodge 2500,4X4,HO Cummins Diesel,QC,SWB,6spd.,Banks boost&pyro,US Gage fuel press.,Edge Drag Comp,4"exh.,cowl hood, bhaf, black Holley pump, 140gph...13psi WOT, Vulcan Big Line, kevlar/ceramic single disc clutch, cheapo fuel cooler, 8x.010" vco injector nozzles, Cat turbo 62-65-.70A/R, 497hp 1089 tq 8/25/14 
Time to turn so's you don't burn. 
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