Yes there is a "limited run" increased cost at play (selling 00's not 000's), but definitely an RS tax on top. But worth it IMO for a bit more raw sound and a good torque hike and better top end too.
Beware the dreaded wastegate rattle - for me really not an issue, I do run a 200-cell cat (Integrated Engineering) and that makes quite a difference. It doens't bother me anyway to be honest.
I wasn't too keen on the look of the scorpion, preferred something with a smooth taper and 3.5" - 2.5" split, and paid extra for it. BCS does look good, I don't know anyone running it but the Wagner looked OK too albeit usually quite pricey. Seen a couple of good deals on it though.