yeah the "chip" thing is mostly bs. if you want more power you need proven modifications to the stock design. the closest thing to a "chip" is replacing/reprogramming the ECU, which is expensive.
first i'd suggest your buddy join the forums and read whats already been posted and talked about.
or just google search what performance parts are available.
what kinda of mazda 6 are you talkin about? you gotta be more specific.
