how much would a borla cat-back cost me? Are they all stainless steel, cause that is not too important to me so if I could find one not stainless I could save some cash. Are their any other adjustable exhausts? and finally, are they loud as hell, cause that is what I really really want.

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91 rs, convertible, K&N, Edelbrock open element cleaner, 3.73, B&M mega-shifter, goodmark cowl-induction hood,tinted windows

 

also, do they come in different diameters? if so, which one would be best for my car?

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91 rs, convertible, K&N, Edelbrock open element cleaner, 3.73, B&M mega-shifter, goodmark cowl-induction hood,tinted windows

 

jm91rs,
Just my .02 cents, but I would go ahead and buy a set of headers vice the Borla cat back system. There is currently a GPL for SLP headers on this site, starting at $350.00 w/o air $375 w/air. The headers will definitely wake up your motor since you already have the open-air element. Next step would be to go with the high flow catalytic converter then maybe a flow master exhaust system. If you were to go this route and did the work yourself, it would run you around $800.00.
As far as the Borla cat back system, yes I do have it now on my 92 RS. I've had it for almost 9 years without any problems. Having the interchangeable plates do come in handy depending on my (wife's) mood.

 

ok 86z/92rs, I was seriously considering the flowmaster anyway, but which one is the loudest. I want the car to rumble and be loud as hell when I get on it.

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91 rs, convertible, K&N, Edelbrock open element cleaner, 3.73, B&M mega-shifter, goodmark cowl-induction hood,tinted windows