The lowest budget approach is to remove the center resonator on the stock system, a pretty quick job for any decent shop. After that if more sound is desired install a muffled sport (not race) tailpipe. I was lucky and able to get a very lightly used Supersprint for a nice price. It has straight thru center and the regular (not sport) muffler. Sounds just right for me but that is personal taste. Make sure to order a new downpipe gasket, warning they are pricey. I’d rather have a shop take it down, measure cut and weld in the new piece. Save the resonator if you might want to reverse.