Not really that stunning, K&N is all hype, I threw mine in the trash rather quickly when I noticed oil on my inlet plenum and throttle body(Have a Gen 2), went with a paper filter, plastic pipe and MAF ******, and my intake/piping is dry. After reading online other people say the filter oil will slowly ruin your turbo and sensors. Stay away from anything that is reusable, is cotton, and requires oil. Make your own and don't use metal. ABS plastic all the way.
Interested to see your Air Fuel ratio on the dyno.
I partially disagree with you on this one. I've have a K&N filter on my motorcycle and all of my cars up to this point. With K&N Filters from the factory, I've never had any oil find its way into the intake or intake manifold. Most people run into issues when you "recharge the filter". The biggest mistakes I see people do (due to having to use their vehicles within 6 hours of cleaning/oiling).
I've always had success with:
1. I start the process at night.
2. Wash filter with Cleaning Solution. I clean from the inside -- out, then outside -- in
3. I put fan on the filter and let the filter dry for 4 or more hours (depending if the filter is dry or not). I wait until the filter is FULLY dry.
4. I apply a VERY light later of oil on the inside of the filter. I apply a light layer on the outside of the filter. I let the oil "dry" for 2 hours. I then reapply in the areas that don't have a consistent color. Dry for 2 more hours...
5. I then wipe any excess oil run off from the filter and its good to go.
I do agree with you, however, on the metal vs PVC if the only thing the separates the intake is a single silicone fitting... on the 2014 SHO, There is plenty of plastic pipe that is run between the filter and the intake manifold that I would assume the temperatures would be minimally be impacted given the flow of air, the design of the intake.
The K&N intake box allows for air from under the hood lip to flow into the intake compartment. It also uses a gasket that seals the filter from the rest of the engine.
If I can find inexpensive high flow air inlet temperature gauges, I would consider doing an experiment with inlet temperatures of Metal vs Plastic intakes.