With modern cars, some of the best performance upgrades don't involve hardware changes per se (or even replacing the driver). Rather, a software upgrade replaces or at least reprograms the microchip controlling engine performance. This is especially useful on cars with turbos, because the factory chip is generally programmed conservatively to avoid abusing the turbo.
The boys were quite excited to hear that they and Emily were being microchipped yesterday. I didn't have the heart to tell them that their procedure identifies them with a microchip implanted just under the skin in the scruff of the neck. No performance improvement at all.
However, if our indoor cats ever get out and lost in the great wide world, we now have a better chance of getting them back.