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Re: exhaust noise
Sounds like a hanger came loose. Crawl under the truck a giggle the exhaust, you should be able to tell where it is comming from.
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2000 Silverado Z71, 5.3L, K&N GenII Air Intake, Y-pipe Exhaust (no muffler), Bosch Platnium +4 plugs, 242k miles and still running.
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