I got my test/track pipe from a guy locally (Borla Off-Road X-Pipe). You have to find someone who will install it if you don't do it yourself, because I believe most shops can get fined $5,000 if they remove a cat and install a xpipe. I had to pay cash and didn't get a receipt. However most muffler shops can fabricate one right there... just bend some pipes slightly and weld on the connectors... wouldn't take them more than an hour or two.
And on that note, welcome to UB.
Hope you stick around.