I haven't, but you have to remember you sacrifice particles filtered for flow, and a street car doesn't need to flow like a racecar. I run WIX 51515 on the street, and 51515R on the racecar. Your oil filter isn't going to be a bottleneck in a street motor.

I dont use the 51515R on anything... it has
less filtration the 51515 still has plenty of
flow fora race engine

Glad you said that, I'm actually thinking of switching back to the standard for racing. I still get 80psi at WOT with a 3/8 pickup and street filter, same as I did with a milodon external and race filter. Makes no difference I'd say as far as restrictions go.

i had a new fram filter collapse internally on a turbo 4 cylinder minivan with very few miles on it almost cost me that engine. oil light came on when my brother was driving, and he was smart to shut it down immediately. when it was back in the shop and a mechanical gage was installed, there was tons of oil pressure. lasted for about 10minutes run time then fell to almost zero. shut it off and restarted, normal pressure. pulled the filter off, and you could plainly see the insides were collapsed ! put the standard wix 51515 on, and that engine lasted a very long and healthy life. never again, as mr. p said, used fram filters.