Wondering what to get?

I was wondering were could i get a set of say Flowmasters or Mac mufflers with dumps.I even saw spintechs with the side exit Tailpipes they looked cool...So were is the cheapest place to buy just mufflers with Dumps...Alos how much louder will that be compared to me running Tailpipes...My exhaust is shot on my 93 It has some hacked up flows on stock tailpipes..has leaks all over i was thinking just to buy some new muffers and with flowtubes and dumps...On a GT you dont see that tails anyways...so any ideas?...Thanks...

Thanks guys for the info..I already have a off road H-pipe..and for just using what i have its all hacked up already I need new mufflers so thats why i was wondering if i should go this route..I also see spintech makes a set to i can use ...I want something loud but sounds good also if you know what i mean...This is my daily so if i dont like the ways it sounds on it i can use it on my 87 which isnt a daily driven car....