i think you are remembering backwards, they should be offset in center out.
the offset inlet is to be able to run the exaust closer to the driveshaft where it is possible to tuck it up slightly higher and more out of sight.
centeroutlet is more because they where that way stock and that means that there is more tailpipes that fit the car that way and that puts the outlet right under the location where the hanger behind the mufflers are suposed to sit