I've got the AirRaid FIPK setup. Simple to install, seems to make more midrange torque (what I was after for trailer-hauling), gets a little better MPG according to the gizmo on the roof, but brace yourself for a DRAMATIC increase in intake roar (exhaust noise, what exhaust noise?). Is it the best? I dunno, it's the only one I've ever put on a Hemi... I'd buy another one if my truck "disappeared" overnight... It looks the same as the Brute Force shown above, just without the chrome...