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Re: 2007 4300 DT466
Posted to HD/Fleet Forum on 8/12/2020

Kevin, sorry for the delay. Hopefully you have it fixed. This is an EPA 04 engine so it is a Catalyst muffler

(Exhaust gases exit the turbocharger and flow into the exhaust piping, through the muffler and catalytic converter or CDPF, depending on application... Login to read more.