Cat-Back Exhaust kits, Worth the $?????

[Scotts91Blazer]

The connector pipe from cat to muffler has a leak, I was wondering if anyone has put a cat-back kit like a flowmaster or Gibson set on, and if they noticed any improvements, I saw flowmaster has one for my 91 blazer for about $230 (kinda steep for a connector pipe, muffler, and tailpipe). I want to keep this truck fairly stock, and still comply with emmission regs, but I'd like a bit more performance and sound from the Ol' pipe , but I don't really want to go the header's and dual exhaust modifications route.