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Power Strokes
6.7 Aftermarket
Donaldson
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[QUOTE="mikeeg02, post: 1411946, member: 24194"] Well I ended up ordering a M100465, 4"-5" adapters for both ends since I'm running a 4" tailpipe. It's significantly quieter than the 4" M085171, and drone is significantly less. Now it seems you have to work to find a condition to make it happen. (Right combination of windows open/closed/rpm/engine load). Definitely happy with how this one works. And it's definitely a big old girl lol. No more obnoxious tail pipe whistle at 15+ psi boost. Just standard turbine noise now. Very nice design. Thanks for posting your part number! And not that it's terribly different, but mines a 7.3. [/QUOTE]
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