New exhaust doesn't sound all that great

Got the Dodge pickup big plastic gas tank blues? Been there.
On my old 76 D100, I ran Heddman Hedders, 2.25 pipes, and Thrush glass packs. Routing was: Driver side; header, collector, 45 degree bend, glasspack, straight pipe. Passenger side; header, collector, glasspack, 45 degree bend, straight pipe. This made both pipes exit out the passenger side just behind the cab. Sounded great, assuming you didn't want to hear the radio or passengers at highway speeds.