I wasn't sure if the stock intake had much of any restriction. I asked a buddy of mine who does his own garage builds and so on, he suggested to give this a try, so I did. I have noticed an increase in MPG with the home fabricated piping, then i noticed a bit more with the KN drop in.
I ran tests (checked mileage with piping and without KN, then tested both together and so on) with either or to make sure I am getting some type of an increase as I didnt want to lose any MPG..it was a positive result in the end. I was going to powder coat the pipe to bling it out, but I haven't had the chance as of yet. If I had some type of negative or similar results with the new configuration, I would have never left it installed.
Whatever it is, it has worked great for me so far..use to run about 13 to 14 on the highwY, now I run 17 to 18 at this elevation, which I'm eager to see how it works at sea level. I did go TDY to Utah, with a lower elevation just by 1000 feet or so, and it caught my attention a ton, with about 15MPG in the city..easily 18 on the highway.
I can't check any power gains considering I never went to a dyno or anything, so I can only go by fuel mileage, which doesn't correlate to any power, but shows some saved gas in the end...
But as everybody mentioned, nobody bought this truck to be a prius.