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I have a 2000 with a new 38R and a Barder billet WW2. The turbo is much quieter than a typical 38R, and the pitch is a much higher whistle that a non ww2 38R. It sounds like what you are describing. I've heard plenty of 38R's with their distinctive moan and that's what I was expecting with the new turbo and wheel. Instead, it is much quieter, and it's a much higher pitched sound than a stock 38R. Also, I hear it (slightly) on daily driving without seeing any boost on the gauge. As I put accelerator and start seeing boost the sound gets louder and goes higher. So its not what I was expecting, but i think it's normal.
I have an aFe Intake. Power is great and comes on low, EGT's are low, I haul a heavy camper and I'm very pleased with the combo.
00 F350 Lariat CC, DRW, 2wd, 7.3 , Auto, Tru-Cool MAX tCooler, Delrale Deep Cooling Pan, JW Valve Body, aFe Stage II Intake, aFe 4” Turbo Back, Pillar Mount Gshift Gauges (Pyro, Boost, Trans), GTP38R, Barder Billet Wheel, Bellowed Pipes, EBPV pedestal, PHP Hydra, Riff Raff FRX, HPX, EBP, Swamps HV/HF IDM, Dieselsite Max AC. 2014 Lance 1191 Camper, Supersprings, HD Timbrens, Sumosprings, Front+Rear 1.5” Sway Bars, Monroe Gas Magnum Shocks, 19.5" Vision Rims, Centramatics, Sumitomo 16 Ply.