there use to be a guy on here called dynoman 14 and he had all kinds of space age products one of which was a special oil filter
one of my customers bought one of his "special" filters and brought it to me
it has a completely white can with no markings what so ever but when you look close it had 51061 stamped into the head of it where it screws to the block
51061 is a wix number ---so my guess is ---it was a simple non racing wix filter
I never did test it---it is actually a great conversation piece.
I also had a customer that ran NO filter
he claimed that he saw a power increase on a rented chassis dyno---I never tried this
here is my thought on filters and power---
some filters (due to restriction) will create extra oil temperature
extra oil temperatures will cut power
Brad
www.race-1.com