All of the Ford and Mopar oil filters I have heard of all where bypass types, the Wix standard filter bypasses 20% and the race filter are suppose to bypass 40%
I have used the Oberg screen filters also, they have a built in bypass also but you can set them up so they will make a light come on when they start to bypass
![up up](/ubbthreads/images/graemlins/custom/thumbs_up.gif)
As far as metal bypassing the oil filter versus how small the particles the filter will pass through it the filter media determines that , doesn't it
All the GM filters are 100% filtered but the motor will loose HP when using them also
![shruggy shruggy](/ubbthreads/images/graemlins/custom/shruggy.gif)