The price has dropped on the 3" B&B system into the $900+ range.
Flowmaster is the cheapest, Summit sells it somwhere in the $550 range.
LT1 catbacks are more expensive and the kicker is they yield very small gains if any. I saw no gain from the addition of a 3" B&B on my 94.
Fortunately I bought my system used. I was planning on just swapping mufflers but the deal was too good to pass on, otherwise there was no way in hell I was spending $800+ on a cat back.
The factory setup (catback) is pretty good on these cars IMO.
One option and the cheapest route would be to find someone selling or giving away a used cat back. I see them for sale very cheap or being given away on the Corvette Forum all the time. Put that on and then you can change the mufflers or add elims. You'll spend alot less than $600.
Since you don't have emissions though you may want to consider long tube headers. You could spend the $600 you would have on a flowmaster on long tube headers instead, put a factory cat back on with it , again you can do whatever you like with mufflers.
You'll see a much bigger gain than you would with just an aftermarket cat back and you'll spend only a little more than you would have for just a catback. If you like LOUD the long tubes through aftermarket mufflers or elims will do the trick. -lol
just throwing some idea out there for you.
There are 2 cats on the LT1, here is what they look like:
http://nick.vettextc.net/for_sale/LT1_Cats.JPG
(driver's side at the bottom)
There are three O2 sensors on the 94, 2 in the pass side cat and one on the dr side.
good luck
