I've got three new-in-the-box universal Magnaflow high-flow metallic spun catalytic converters (59955) for $75/ea plus S/H if needed ($94 on eBaymotors). The are the most free-flowing and smallest of their like of converters and the same ones I used to replace my stock converters on my '86 GT. They measure 8" in length, 4" in width, and are 2.25" center inlet/outlet.