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The Wix 46664 is rated at 950 CFM WIX - Air Filter Line: WIX | Part # 46664 1...

http://india.donaldson.com/en/engine/support/datalibrary/065857.pdf for how to calculate CFM for Diesel engines. You can also take note that Donaldson says the stock 250 HP 6CTA 8.3L engine requires 632 CFM @ 2500 rpm and 1592 CFM out of the exhaust at 900* F. which when you divide the exhaust...

The Ram Air will not totally solve the problem but it has shown that it flows better than the stock mushroom cap along with being better looking. The main problem is the overall length & number of bends many of which are 90* in the intake plumbing that is/cause the largest restriction(s)...

Have you pulled the Mushroom cap off and tried it?

http://www.thosemilitaryguys.com/air-cleaner-custom-kit/ for the TMG Air Cleaner Mod kit

What did you use to cut the housing down?