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Hey guys it's not inside the muffler, it's the location proximity of the muffler to the engine block. If you have the stock manifold there should not be a problem, but I have the 1320 and when installed, the muffler body rested firm against the block. All SS's are not the same built. I had to put a washer where it was touching the block. If you have a rattle, it's that location or where the exhaust tip is close to the frame. It maybe hitting. It's not internal.

I cut out a portion of the lip just for assurance that it wouldn't touch the frame.
I just "pre-dented" the exhaust with blunt hammer at the bolt location you have pictured. I still have a rattle that comes and goes which I think is internal? A couple of taps on the key fob cures it most of the time. If I recall the valve is variable, hence some rattle in it when partially open/closed.
 

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They made a revision to their muffler from ball bearing to spring. We were informed that the change would have no effects even with the placement of the muffler being close to the header. After multiple issues and problems, they admitted that the heat from the placement of the muffler had caused premature failure of the muffler system. So they are sending us new mufflers to replace our current ones. These mufflers are coming from Austria which is why there's a long delay. We do not have tracking of the product when it leaves the shoreline but only an estimated time of arrival which we were told sometime this month.
So there really is a such thing as "muffler bearings?" :banghead:
 

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I ordered this last week as "preorder" on slingmods website it says estimated ETA end of this month, Sept 30, 2016. Sure hope it doesn't have any problems.... I don't want to install it but once.
 

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I too have the rattling issue. I'm up in Canada though :(

I'll keep an eye on this thread and see how it pans out and what the solution is... Hoping I am able to fix it here without having to go without the sling for a couple weeks/months to send the muffler in.
 

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I am having the same issue but with the side exhaust @[email protected] . I had the shop look at it as I could not find anything loose. I only hear it in neutral while I rev the engine, or starting in first gear. The worst is when the clutch is just starting to engage...

Thoughts?
 
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