I don't get much time on my PC so I'll post my ?'s and if you know spread the knowledge my way if not point me in the wright dirrection.
There are 3 cheep mods on E-bay. One is a timing addvance mod,
another is a 02 senor mod that tells the ECU to add more fuel by fooling the ECU by showing it a cooler temp, and last i haven't researched it yet but seems to be a EGR block off or something to that effect. They say its a exhaust mod. There starting the bids at 5$ which says to me its worthless or i can do it myself. I have done mods like these on my 90 talon Tsi. Like removing parts from the MAF to gain acouple psi of boost and blocking off the EGR was what they call a free Mod. Well thanks in addvance.
Later
TiLm

 

my personal opinion on all of those 20HP for $20 mods is that you should take the money you might have spent on them and go to a movie... you'll get more enjoyment and satisfaction out of that. Of course if movies are not your speed... consider beer/food/toys as other alternatives

 

If that stuff really worked, the car manufacturers would have already put them in the car to begin with. There's no such a thing as cheap/free horsepower.

 

Stay away from that crap. You should buy performance parts from performance shops, not scambay.com.