Saying a high flow oil filter will yield more HP is like saying Helium in the tires will give better gas mileage. How stupid do they think people are? It's not going to happen. Yeah, there are high flow filters out there but they sacrifice filtration to do it. All oil filters have a Beta Ratio which is a general statement and test of a filters efficiency. But don't read a lot into the test if you research it because no where in the test is there a control on the pressure, temperature of the fluid, viscosity, etc. They just run glass beads of a known size in a fluid thru a filter and what comes out of the other end is the material that did not get filtered. Filters will also have an efficiency rating showing single pass or multipass to get the results. Obviously, a filter rated multipass is letting a lot more material thru than a single pass filter that equals the performance. Use a quality filter like a Motorcraft or Purolator, don't pay a lot for it, sit back and enjoy the ride.

As far as air filters go, the stock unit on a recent production Ford truck will handle 7 times the requirements of the engine. Generally the air speed thru the box/filter at WOT never exceeds 7 miles per hour. So what is an after market gauze type filter going to do to yield more HP? That's right, absolutely nothing. If you run in an extremely dusty environment, they can have value but they also sacrifice filtration versus a paper media. It has been documented that most of the gauze type filters will have gaps in the media exceeding 40 microns. A particle of that size will do damage to your engine. A micron is 1/1,000,000 of a meter.
Yer truck, yer money.

 

Just think of the environment. You're putting all those paper filters into a landfill. As opposed to all the oil and chemicals that it takes to clean and oil the filter.

 

It all came out of the ground anyway.