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In my experience there is NVH introduced with a lot of setups.
I ran AA rear V1 for a couple years and 2-2.5k rpms had some NVH/drone associated with and without an aftermarket midsection. Don’t believe this caused any rattling though - I’m very particular about interior rattles. All supporting brackets are tight and in place?
I have a AA midsection and that turns my car into a race car sound box with the larger pipe diameter. More sound, more feel, more everything….
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