Dual Exhaust

hey guys, i was wonderin if anyone has converted a single exhaust 93 thunderbird LX to a dual exhaust...i wanna know:

1) is it worth my time and money to spend $600 on a kit? or what should i do?

2) if i get a kit, what kit have u used and how does it sound, feel, and perform, etc.

3) if not the kit, what did u use?

i really need some help here, any help would be appreciated