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Message: [QUOTE="79jasper, post: 893863, member: 4913"] That's what I did. Just a piece of 4 inch exhaust pipe about 8 inches long, and a "6637" filter. Since no one asked how I know, I'm posting why the factory box sucks. [IMG]http://img.tapatalk.com/d/14/01/24/eqa4y3ag.jpg[/IMG][IMG]http://img.tapatalk.com/d/14/01/24/epuzyve8.jpg[/IMG] Sent from my USCC-C6721 using Tapatalk This is supposed to be a cross reference to the 6637 filter. Everyone says the actually Donaldson is better, which I believe. ACDELCO A1474C AIR REFINER ARM08-5011 BALDWIN FILTERS PA2818 BIG A 94637 CATERPILLAR 3I0003 CARQUEST 88637 CUMMINS 2912986 CUMMINS 3912020 [B]DONALDSON B085011 H[/B] DONALDSON ECBO85011 H DONALDSON ECB085011 H FLEETGUARD AH1141 FLEETRITE AHR81141 FRAM CA6818 GFF AF359214 GENERAL MOTORS CORP. 25177209 HASTINGS PREMIUM FILTERS AF2329 HERCULES B085008 KRALINATOR LA1458 LUBER-FINER LAF2533 The one in bold is the "tymar" one that's in the tymar kit. [/QUOTE]

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