Thread: How to quiet down 2020 1ss with full header back system
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Old 02-26-2023, 03:41 PM   #14
Casper the friendly G
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Drives: 17' Chevy Kamaro SS 6 speed
Join Date: Mar 2022
Location: US
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Quote:
Originally Posted by 6spdhyperblue View Post
Cut the top of the npp open and stuff with muffler packing and weld closed



Will also deepen it and remove all rasp.
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