Easypeasy: 3 in trunk, 1 in front seat. I do it every week for track days.
The trick is to disconnect the top of the trunk shock struts. That will let the trunk open enough to get the wheels "inside". I have a 4" by 4" piece of wood under them to support them as they wont fit all the way to the bottom. But this gives me space underneath to fit my floor jack.
And yes, these are 8.5 and 11" wide OM 996 Gt3 wheels with a one inch spacer in back, that are a tight fit with Bilstein PSS9. I have rolled the fenders a little.
