Chief762x39

I'm considering upgrading the exhaust of my 1999 Trans Am. Is the SLP Dual Dual catback system still available for purchase and where can I purchase it from? I'd even consider purchasing one used if someone has one available in good condition for the right price. Is it correct that this system is the same one that came stock on the Firehawks? I am wanting to replace my stock exhaust, because the previous owner welded a cheap cherry bomb muffler in place of the stock one and I don't like it. I also want my exhaust to be 50 state legal and have no idea if it still is now. I suppose I'd also consider a good used stock WS6 exhaust. Is it easy to install a catback exhaust system yourself?