Thread: NPP exhaust on 2020 SS seems too quiet
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Old 11-15-2025, 08:36 PM   #17
Val Walkinshaw
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Drives: 2018 2SS 1LE
Join Date: Jun 2018
Location: SE MI/ NW OH
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Quote:
Originally Posted by Navigator View Post
Secondary cats or both?
Secondary.

Primary requires a tune. Not a road I'm ready to go down yet.
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