I unbolted the two bolts behind the y-pipe and dynoed and dynoing with it on.

You could get just one WK17730 and replace the existing muffler and that should do you well for $40 parts, $20 labor.

I might have a new in box dynomax superturbo 17730 lying around in the garage when I wanted to do a dual, I could look and get back to you.

If not, I would goto ebay and get one.

FWIW, I live in Indiana.

98 T-Red Contour LX V6 Mtx 106k miles
9" K&N, Aussie Pipe, Dual Mode Damper, 19lb. injectors, SHM MAFterburner, Ford 9mm Wires, Mystery Mod, ShoShop Off-road Y pipe, Dynomax Resonator and Muffler, 2.5" custom cat-back.