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Tour and ice modes are quiet with headers and stock NPP muffler/exhaust. However, valves are open upon starting so it will still be loud initially. I just did a Corsa NPP change out this past weekend and gave away my stock NPP suitcase to a member of the VA Camaro club. Like previously mentioned, find a used stock NPP suitcase/muffler and install it and it will quiet it down some as long as you are not in Sport or Track modes.
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2022 Camaro 2SS/ Whipple 3.0 / 2"Headers/ PRC LTX Heads/ Forged Internals/LT4 fueling/ DSX Aux/
DSX Flex Fuel/ Meth Injection/ Katech 112 TB/ RotoFab Big Gulp/ Corsa NPP/ Various exterior mods
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