Thank you for taking the time to help me with this.
That's ok. I appreciate your intention to help with the first measurement you provided.Sorry I’m not going to remove my slipon just measure. Might as well do that yourself, right?
I have an extra Arrows muffler in the garage I could measure when I get back home today. If it's the diameter of the end of that pipe where it attaches to the underbelly cat that you're talking about
Edit: see if these images are of any help to you
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