Ram exhaust

I was given a 1990 Ram D150 with 5.2L it has the stock exhaust, I was wondering if there would be much of a difference if I put an aftermarket muffler(flowmaster,cherrybomb,thrush) etc, on it with either a 3inch single pipe out the rear or dual it out with 2 mufflers and 2 tailpipes with the standard 2 in pipe.
Author: dodgetrk