I have a Pypes Pype Bomb catback on my LX, fitment is good, sound is great, only real downside is the tips are rather huge.
Pypes Pype-Bomb Mustang Catback Exhaust SFM29V (86 GT; 86-93 LX; 94-04 GT, Mach 1, Bullitt) - Free Shipping
I got used to it though after looking at my GT with it's huge...