Sidepipes or not?

My son has a '67 Dart, 440 w/Fenderwell exit Hookers. Sure it's tight but the car has it already. Since the collector is towards the outside of the car, it seems to make sense to have sidepipes if you want to have a cutout as well (non-electric cutout).

Our other rig has sidepipes as well but hiding 5" exhaust was not an option (no ... it is not a diesel but a blown 540 making over 1200 Hp to the crank).