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Hey Medic My post is an extraction from an American Iron Magazine – September 2004 I use the HD Filter, but am going to give the K&N-171C a try for the alledged K&N marketing of more flow and its larger filter area 164” square (73”x2.25”) vs HD's 63” square (36”x1.75”. After looking at all...

Some info that may help or confuse. The HD Filter is a good filter, but the K&N 171C has increased filter area. From American Iron Magazine – September 2004 Mike Goshert’s oil filter tests and measurements The psi readings in the Bypass Valve column are the pressure at which the bypass valve...

From American Iron Magazine – September 2004 Mike Goshert’s oil filter tests and measurements The psi readings in the Bypass Valve column are the pressure at which the bypass valve opened to let unfiltered oil pass by the filter and go back into the engine. Filter Part # Bypass Valve Filter...