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The OEM filter flows more air than needed for a stock or mildly modified engine and does as good a job filtering air as any filter money can buy.
Aftermarket air filters are proven to do nothing for a Cummins engine until horsepower exceeds something like 450 hp.
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Harvey Barlow
2008 Ram 3500 SLT QC & Chassis w/ CM bed
2007 HitchHiker Discover America 32 LKTG
2010 Goldwing XM/Nav
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