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I went back to the original stock mufflers from the Screamin Eagles in 2006. When I took a test ride found that the upper rev range was severely choked up. That's with the Stage1 canned map and AC. I kept opening the baffle wall up in the mufflers until I got the upper rev range back. I put my SE mufflers back on about 3 years ago.
I picked up a set of take offs for my 2004 Heritage. I got sick of listening to Screaming Eagles and they are now nesting in the local landfill. Much nicer ride. After the install I noticed that the distance from the baffle to the end of the muffler is not the same in both mufflers. See photo- the blue tape signifies where the baffles are. I don't remember them being marked "front" and "rear" but they are definitely different. I think the reason is to make each pipe have the same distance from the head to the end of the baffle. In that case, these are on wrong and need to be reversed. Right now the back pressures are unequal. Thanks.
 
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