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The Unichip is a piggy back computer system that ties into the existing wiring harness. TRG use to own it, but they sold the entire business. Have not seen it much recently on anything. Use to use old technology that could not even deal with the Motronic fuel map. On turbos, you had to install additional injectors in order to add more fuel.
If it has the 3.8 engine with a chip, 340hp is what you get....
My previous 993 was a 3.8 and had a performance chip (tailored to my car's characteristics), plus a sports cat and muffler, and all I got was about 309 hp.