Aftermarket keyless entry and start sys
 

I recently went to the dealership to drop off my Mazda 3 for some routine maintenace and I went to go check out the '07 models. They had a RX-8 Grand Touring with the Advance Keyless Entry and Start System installed. I asked the salesman if this system is caplabe of being installed on my 3. The guy said no and that it has to come from the factory with it installed. My question is, does anyone know if they make an aftermarket system like this one?