I just got this formula yesterday and the exhaust sounds great, i looked underneath it but it didnt have a label but im assuming its a flowmaster. If you know it let me know and let me know what you think of my new ride.

http://www.youtube.com/watch?v=lO8HCaU8pa4

You have a Firebird,of course it's a nice ride! I see you have the later year tail lights to. From what I could see it looked like a Flowmaster muffler with OEM tail pipes and tips. I've not seen wheels like those either,very different. They kinda remind me of the first 3rd gen wheels. Is it an automatic or manual? Been to the drag strip with it yet or know what it runs? Welcome to our site to!

Looks like a flowmaster, but could be a knock off...it didnt sound like my flowmaster, but if it isnt welded on to the pipes, if you dop the muffler it would probably stay on "top" of it...on mine the flowmaster logo is on the opposite side that u can see...Idk why, but it is...

There are only a few exhausts that I would guess by the sound of the clip. Flowmaster, B&B Triflo, or Edelbrock. I am going to go with Flowmaster because they are pretty much the only exhaust manufacturer who does not make their systems out of stainless steel...so they rust out. From the looks of it, your muffler's got a bit of rust around the edges of the muffler. Just a hunch..