I've heard from a few guys that have had an issue with the oil pick-up either working loose or cracking. This would cause you to suck air or cavitate the pump, which might lower your oil pressure. Maybe the pipe or the pick-up is rocking back and forth?
Some oil filters are more restrictive than others. Try an OEM Honda filter (which quite frankly are about the best out there for our cars).
2002 Cen-Div ITC Champ
(Converted to G-Prod in 2003)
(Bumped to H-Prod in 2008)
2008, 2011 HP Cen-Div Champ
2011 HP National Champ
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