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Dean,
You may be combining several side pipe issues that have been discussed. I welded on a transition on my 3" bore side pipes to smoothly funnel exhaust into the 3" muffler from a 3.5" collector similar to the way you indicated. I just didn't want any abrupt walls to impede the flow when it could flow smoothly. I don't have stainless specialties mufflers though.
Then again, I may be wrong and never saw a thread or two about this.
R
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