It might just be a pipe and a big filter on it, but it really does make a difference. They are designed to pull in more air and at lower temperatures then your stock air box. This increase in air helps ignitions greatly, as the main mixture is air eg 10:1 compression 10 units of air for 1 unit gas. To get a real result you need to get a proper tune to utilize the CAI. I have an 07 V6 with the FRPP CAI and its worlds better then the stock setup I had it, with the new Mustangs 05+ you need to tune or you can end up with a CEL or experience loss of power as the car is completely computer controlled. Cold Air Intakes simply are the best bang for your buck upgrade you can do to your car.