Another ebay chip explanation

[Golddeenoh]

generally speaking, these $20 to $100 chips do nothing or hurt the engine. The guys at mighty car mods tested out a supposed $20 chip that nets 35hp, needless to say they proved it to do absolutely nothing but take up time and change led colors on it.

https://www.youtube.com/watch?v=VGtImIP6j3A#t=1578

[cali yaris]

I bought one and opened it up to find one $.20 resistor inside.