lol, I had my truck on open headers for a day and it was horrible. It had a flowmaster super 44. No cat but 2.25 tubing. I love how it sounds. Barely hear it in the cab but sounds really throaty outsideAwesome. I was thinking Flowmaster 44 or flowmaster 40, I think I will go with the 44.
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If I was you too, I'd leave your cat on, when I took mine off it made it a little louder but honestly doesn't sound as good