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Not sure of your temporary configuration, but if you have an open element air filter, you will hear every noise the turbo makes. Probably perfectly normal.
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2003 E-350 7.3, 38R, DIY intake, 4" turbo back, Swamps Tunes, forged rods, exhaust ported heads, comp 910's, h-11's, stealth twin pumps, 300cc hybrids, racerx trans and tc, water injection
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