I have a 1997 Thunderbird with the 4.6 engine.I just sent Summit back the Catco #4593 system because it was really only for 1994 & 95 4.6 models (it was inches off in many directions from ever fitting).For 1996 & 97 Thunderbirds the correct part is #CTO-4152 (they don't have any photos, but it will look vertually the same). If you get the #4152, please post again with the results, as I will then re-order one for myself too. Unless of course, you have fitment problems that don't get resolved. The Catco secret to increased flow is that the third cat is a shell only.
Catco look stock , Magnaflow do not look stock. Both systems can easily be spotted out by one of us T-bird lovers, but not necessarily by a smog inspector.
I really think that the 94-95's have a difference in exhaust manifolds from the 96-97's, so I don't get how Magnaflows fit all four years. Edman-out.