I think arospeed is a good choice. I have one with a 4" tip, sounds and looks good, no complaints! I got it for about $90 from
r-speed.com

98 contour SE 2.5L MTX
resonator removed, sho shop cold air intake, arospeed muffler, painted center ring with grill insert, painted interior pieces, clear side markers, debadged and dingless.