WTF? is this for real?

[Strannik]

Originally Posted by flight doc89

It doesn't lean it out; colder air means denser air means ecu dumps in more fuel to maintain stoich. Colder air readings without colder air means ecu dumps in more fuel than stock fuel map allows = rich mixture

which means waste of fuel and stuffed cat and absolutely no power gains
you can just disconnect the temperature sensor used for warm up and run permanently rich

i think those boxes make ecu think it actually gets less air then it does - thats the only way i can see the car would be making more power
mk3's run rich from factory already, no point making it even more rich

regarding under 20$ mods, there is a whole thread of them listed on supraforums.com, just look over there see if anything suits you