i have a friend that blew a motor after he changed his oil at the track and put a fram filter on.His said his oil pressure was low low at the end of the track. A local engine builder came by after he blew the motor and told him his pressure drop near the end of the track was from the fram filter. I had a fram on my motor and noticed the drop in oil pressure also at the top end. I changed it and had oil pressure again. I wont run a fram on a race motor again.