You can have side exiting exhausts behind the rear wheels with a TRD or Borla exhaust system. A few members have it here.
On a side note if there are dual exhuasts that exit out the rear, it would mean there are two pipes and resonators to smash when wheeling and two tailpipes to have the muffler shop mod to exit out the side.
It might get there one day, since the 5th gen Camry's didn't have it, but previous gen Accord did and now the 6th gen Camry has dual exhaust. Only time will tell.