If it's the knock off Flowmasters that you're worried about, I have a pair of "real" 3 inch Flowmaster Super 40's in like new condition I ran on my car for a while. They are for A-body offset inlet offset outlet exhaust system setups.
I'd gladly sell them to get them out of my way.
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2019 Pontiac Heaven class winner
https://youtu.be/XqEydRRRwqE
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