All of you are correct, it is an aftermarket "high flow" cat made by Magnaflow. I am pretty sure my fuel mixture is rich so I will have that checked. Olpos, is it really true that if I fix everything that the cat can come back to life? Thanks for the quick responses.

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90 560SEL
H&R springs
17" Alba Frontiers
Cross drilled rotors
Magnaflow Cat
European Headlights
WALD front bumper
Keyless Entry
Burlwood shiftknob
Clear corners, taillights
Limo tint
2 JL 12W6's, JBL BP1200.1, Pioneer P8200R