I just got mine and i am looking at how the system bolts to the cat. The american thunder system has a flange with two bolt holes. My car doesn't have a flange. Did it get cut off at one time? It's an 89 Iroc 5.7 single cat and the exhaust system is the 3" with dual 3" tips. Anyone know where the problem is, my car or flowmaster?

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1989 Iroc-Z TPI 350 auto 4-spd Removed MAF screens K & N filters, Hedman smog shorties, accel 8mm wires, made for you wire looms, cat back, gutted cat.

 

The cat was probably replaced once because the stock cat has a flange that alows you to change your exhaust without welding.