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Thinking a little differently here but I have noticed a definite difference in the sound of the stock NPP on my 2017 SS after I installed a Roto-Fab intake. It is the Roto-Fab version that deletes the sound tube and has the dry filter.
I can definitely notice that over all the exhaust is slightly louder in Tour, louder still in Sport, and a good bit louder in Track.
Definitely, a more noticeable difference between the modes.
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