I am here to tell you that there is no single "best" intake...
- If you do a lot of mudding and water crossings, the best bet is to stick with the factory intake.
- If you want near-perfect filtration and a filter that will last 100,000 miles get the Volant.
- If you want a minimal restriction intake and aren't worried about water intrusion, the AIRAID, aFe, or K&N will do fine.
But DO NOT fool yourself into thinking that you will get a 20 hp gain or a 5 mpg increase. It doesn't happen. I argued with Hennessey about their extravagant claims for over 6 months on the "Z" forum, and all I got was non-answers, delays, excuses, and obfusction because they could not substantiate their hp claims. I was ready to buy and all I wanted to see was a dyno run that backed up their claims. They didn't have one and couldn't produce one.
I will tell you that AIRAID makes no preposterous claims. They make a fine product and they don't lie about it. I consulted with their quite knowledgable front desk until I was asking questions that only an engineer could answer, so they put one of their design engineers on the line to talk with me. I got straight answers to honest questions, and that tells me something about the character of the company. I don't do business with liars. I've had the AIRAID on the 6.2 for over 10,000 miles and I am very satisfied with it. It produces a little more intake honk than the factory intake - I enjoy intake honk on my truck and my motocycle - and it elminated the factory intake's hesitation at abrupt throttle inputs. I get between 15 and 15.5 mpg in town, and between 16.5 and 17 mpg on the road - not measurably different than with the factory intake. (The only fuel saving device applicable with a 6,000 pound high performance off-road 4x4 with a honking big and powerful engine is a mature right foot.)
If interested, you can read the full story of my experience with AIRAID here:
http://www.fordraptorforum.com/f24/airraid-installation-2011-6-2l-3085/