Compare an AWD Pontiac 6000 to its run of the mill FWD counterpart.

- The exhaust hump was widened and raised a bit to make room for the driveshaft to run to the back.
- Due to the exhaust hump being slightly taller inside the car, the AWDs got a revised/shorter version of the standard center console.
- The spare tire compartment was eliminated (spare tire was moved INTO the trunk) to make room for the rear differential and components.
- The entire floor plan was reinforced to deal with the torque of the power in the back.

Even on a car that came with an AWD version from the factory, it took major work to the floor plan in order to get the system to fit and operate. Can it be done? Of course, anything can. Is it feasible? That depends on how much money you have/are willing to spend, how much time you're willing to put into figuring out how to make it work, how much frustration you're prepared to deal with, etc.