For anyone loolking for a cheap set of factory cats to get through emissions. I ran across a set of OEM on ebay. Item number: 220242949957
http://cgi.ebay.com/ebaymotors/_Car-Truck-Parts-Accessories__1986-TO-1993-5-0-MUSTANG-CATS-FACTORY-NEW-FREE-SHIPPING_W0QQitemZ220242949957QQadnZCarQ20Q26Q20TruckQ20PartsQ20Q26Q20AccessoriesQQadiZ2865QQcmdZViewItem?hash=item220242949957&#ebayphotohosting
http://cgi.ebay.com/ebaymotors/_Car-Truck-Parts-Accessories__1986-TO-1993-5-0-MUSTANG-CATS-FACTORY-NEW-FREE-SHIPPING_W0QQitemZ220242949957QQadnZCarQ20Q26Q20TruckQ20PartsQ20Q26Q20AccessoriesQQadiZ2865QQcmdZViewItem?hash=item220242949957&#ebayphotohosting