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> The floor, which remains completely flat due to the front-wheel-drive technology, ...

What about the exhaust? I always assumed that's what the bump in the back-seat floor of all my FWD cars was for.

The hump is typically housing the drive train in RWD or AWD cars; the exhaust is relatively small and can be routed along a flat floorpan.

Civic doesn't (didn't?) have a hump.

It's for:

1. If the car is available in AWD, they don't have to make a new floor pan

2. Structural stiffness

3. Exhaust/fuel routing