I don't understand the meaning of the 2nd sentence of the following paragraph:

Sticking to Woodham's 3.0si for now, I will just reiterate that very little of that original pie wagon does carries forth to today, surely not the engine, which is now a potent E34 M5, sacrificed from a donor vehicle, years back. And this isn't just any old M5 as it has the one and only super rare EPROM chip from the infamous, South Carolina Highway Patrol M5 given by BMW to SC for letting them plop there Z3 plant in the middle of their lowly State. In addition, Woodham decided to add a nice header from BMW Motorsport, connected to a custom stainless steel exhaust.

Is the EPROM chip a performance chip from BMW?