Here are your basic answers everything else can be answered on there website SLP
First off the Firehawk made it's debut in 1991 and will meet it's demise in 2002 (due to GM killing the fbody).
Firehawks were originally only available in Formula trim. Meaning, you could not get a Firehawk Trans Am. I think the first year you were able to get a Firehawk with Trans Am trim was in 1994.
If you go to Firehawk.org you can get a complete breakdown of total Firehawks produced per year and available options.
Currently this is how a Firehawk differs in appearance from a plain Trans Am or a WS6.
The hood, 17" wheels, optional rear spoiler (2000 and newer not available on convertibles), all Trans Am/Formula decals are removed and replaced with Firehawk decals (color specific to color of car, ie.. red car yellow graphics, etc. ).
You get free flowing SLP exhaust, either Billstein or ILE suspension, and Auburn rear differential.
You get custom Firehawk floormats, dash plaque (used to be numbered), key fob, rear deck mat, and custom portfolio.
There were only two custom platform of Firehawks built they were the Comp T/A (about 74 built) and the 10th Anniversary car (about 139 built).
The Firehawks sister/brother is the Camaro SS, although you won't see Chevrolet advertising SLP since they own the rights to the SS logo.
All Firehawks have SLP stickers in the drivers door jamb and glove box. So if you are buying a used one make sure they are there. People will build clones and call them the real deal.
One good thing about SLP in my opinion, is if you need replacement Firehawk parts you must provide them with your VIN so they can verify it is a real Hawk. This helps keep cloning out of the loop.
That's about it. If you need anymore info check out the sites that I have shown. They have much more knowledge than I do.
AIM - SWags2933
84 Fiero SE (being modified)