Hey Ron:
This subject has been addressed over and over. Many studies have shown the Fram filters to be inferior to Wix, Mobil1 and others. Go to Yahoo and enter "
oil filter comparison".
I would be careful about using racing oils. They are designed to protect racing engines under racing conditions. I won't take on the 20W-50 viscosity but I can tell you where I live using heavy
oil with an
oil cooler at street speeds would be tough on an engine. Asking cold, heavy non-
synthetic oil to navigate all the plumbing of a Cobra engine can be cruel.
When I got my Cobra I replaced the Castrol 20W-50 with Mobil1 5W-30 and the pressure increased (a lot). I figure it got through the plumbing, filter and cooler more easily.
Bob