For those who have a set sitting around, here is an indicator of value. May have to polish mine up soon!
eBay Motors: Exhaust Manifolds 1989 Turbo Trans Am (item 260273978324 end time Aug-18-08 18:12:16 PDT)
eBay Motors: Exhaust Manifolds 1989 Turbo Trans Am (item 260273978324 end time Aug-18-08 18:12:16 PDT)