The 5.9s had a silencer ring in the inlet of the turbo held in place with a snap ring - don't know if the 6.7s have it or not.
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Replaced my 24v 5.9 with 6.7 - Hope I don't regret it!
08 Mega-Cab 4x4 Dually, 6sp auto H&S 5" Turbo-Back Exhaust, S&B Intake, Edge Juice w/ Attitude, EGR delete
"Someone stole my DPF!!!"