Hey, welcome to the site!!
These cars dont really use "chips", per se. They aren't just swappable like a chip would be. Instead, all of the parameters that would have been changed by chipping the car can be changed through the ECU. In order to get this done, you need to get an ECU tune. There are 2 places that do this, if I recall correctly, and their sites are below. They should answer any further questions you have there! As far as which one is better, its really a toss up. Both are very respected names when it comes to ECU tuning, and both will stand behind their products. If I were to choose though, I'd go with FSwerks, as they only deal with Foci and treat the community super well :)
Again, welcome to the site, and enjoy!
Originally Posted by BertST
Hop on in babe! No really, you're gonna have to hop in. Roll Cage.
ROTM June '13, PNW Crew #42, SR #245, Rally Rev #02