IAT "Chips"

[HDDude169]

Any advice for the so-called "chips" out there. There seem to be several dozen from a dollar to 30.00, then you get into ecm mods and tuners. Do the "resistor" chips for the IAT really work? Any negatives? Any reason to buy the 30.00 over the 5.00? Most claim 12 to 25 HP, no fuel advantage, but there are 1 or 2 that also claim a fuel advantage. Advise the newbie here!!!
Thanks

[2000T/A Guru]

Dont by any chips, most are just 50cent resisters that they want your to put in your car to change the spark. do not believe the 30hp shit for 20 bucks, you can get the same parts for under 1 dollar at and electronic store and they dont do anything.