how to quiet down 3 inch exhaust

slip your race bullits on the tailpipe, put a self tapping screw in it to temp secure it and take it for a ride. the passenger side is pretty tight but i just built a 3" system for my dart i put the ultra flows and a 12" twister muffler on the tailpipe. they were 16" but they wouldnt clear everything on the passenger side so i cut them down. i think a glasspack type of bullit muffler would be more effective but i had these so i figured id try them. i used a super turbo on my slant it was way too loud and sounded too tuff for a slant so i put a glass pack on it and it worked out great.