I recently purchased a 91 Z-28 and bought the Magnaflow cat-back exhaust and direct bolt cat converter. I noticed when I went under the car, that it has 2 cats. Do I need to purchase another cat or will 1 still be okay with emissions? Also noticed the entire stock system is welded together from header back, so now I got to go to an exhaust shop to have it done..

 

Or did I purchase the wrong cat?
This is the one that I purchased:
http://www.summitracing.com/parts/mp...t/model/camaro