I have read good things on the AFE Mega Cannon (CAI). I have been told by many that there is no real comparison (as far as CFM ability). AND, I am planning on running one of these when I do my other mods.
I also hear good things about the S&B (CAI), AEM (CAI), and Tru-Flo: XDi (CAI).
I hear alot of guys on here running stock boxes with MIA intake baffles and K&N 5.9L filters... I am not sure on results (turbo noise level, and power/MPG increase).
But I feel that my money would be better spent going towards a complete CAI, and not just a drop-in filter setup!
And, If you are planning on heavily mod-ing your truck with performance parts...I would DEF go with a complete CAI, and NOT a drop-in filter!!! You will cook your turbo, because you will NEVER be able to flow enough air for the truck to properly run!
It's up to you?
But I would go ahead and spend the money on a complete CAI!
The turbo is only capably of taking in SO-much air...
...and when your turbo DOES try to take in that much...don't you want your CAI to allow adequate-flow + some, to your turbo! You don't want it to strain to get air, do you? That's what decreases fuel-mileage and power!!!
That's my theory! I want my CAI to be capable of flowing ANY amount of air (w/o strain), that my turbo needs, no matter what!!!