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I've heard of good results with an inverted cone, usually after the muffler.
They can be mounted so they can be removed.
It's not supposed to affect back pressure.
I'm not familiar with the exhaust you have.
Have you thought about the multi-tube Borla?
I have seen them in carbon fibre, though probably experimental only.
I use a turndown and that is supposed to make a difference, though I've never tested it.
Often reducing harshness is more important to the perception of noise than the db level.
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