Insyderz, I have to agree with them all. Although my hand did feel a little itchy one day and so I decided to try it. For about USD70 for 2 units (which I installed on the same stock airbox and inverted the intake funnel to suck air from below intead of from the top) and 3 weeks later, the only thing I could see so far is the fuel economy. I got a little more mileage on this tank of fuel (I'm guess-timating @ about 50KM more by the time I need to fuel up) than I did the last 2 tanks without it. Then again, I've only installed it halfway on this tank of fuel but I've also been "lifting" like crazy at any chance I get just to test the truth to this "myth". So maybe there is a truth to some of their claim but NOT ALL of them. Driving a Stivo, the engine is already running high compression so I doubt this will do much other than giving you the "placebo effect" or "butt dyno". Thing is, would you want buy to try? The 75 bucks might be better put towards something IMHO but then again, its your money, your car and your butt ;) p.s. I don't have a CAI. Was trying a shortcut. LOL :P