There are a couple different tuner categories. There is a chip, and there is a programmer. The chip installs directly on the PCM and is switch-on-the-fly. The programmer plugs into the OBDII port and flashes the PCM. It is not switch on the fly. There are advantages to each of them.
We carry a handful of different options. Check it out
HERE.
Let me know if you have any questions. I would be happy to help you out.