i purchased and installed a mass air kit from ist and have about 80k miles on it so far with zero problems........could use better instructions and my cruise no longer worked but..........got the 76mm maf cald' to 24# injectors, came with an a9p and baumanator, 2 bosch hegos and got the upgraded bap sensor.......
system works great, i also got the air controller which allows you to "richen and lean" by ear which is needed.........i have mine mounted in the cab so i can adjust the mix as driving/gas/conditions change....
you really need a tune to perfect the package but it gets the job done and you don't have to go hunting for things cuz its got it all, took me two days but it was done right. i'm talking welding in the 02 bungs, soldering and running everything right..........overdrive button no longer works either, not my 4x4 low but i just need to add the pins back in....