Audi RS4? Audi and VWs can benefit from chips because their ECUs will read from them. Nothing new really, especially for the VW/Audi crowd(though I'm not sure of the gains). 92-95 Civic/Integras can benefit from chips too(when they get their car tuned, the tuner is essentially making a new chip for them).
In your case, that is not a true "chip", it's a IAT hack(tricks the motor into thinking IAT is higher or lower to dump more fuel). IIRC, the RSXs cannot read from "chips" and only way to change their fuel curve is new/modified ECU like Hondata K-Pro(I'm not sure if stuff like Power Commander will work).