Product Description:

L5P Intake Horn Anti-Surge Ring is the essential piece you need for your 2017, 2018, 2019?2020,2021,2022?2023 Silverado / Sierra 2500 or 3500 L5P Duramax. With the added airflow, this Anti-Surge Ring will get you the performance you want without the potential damage that comes from a surging turbocharger. 

Furthermore, the stock intake air-horn on the L5P is commonly replaced because it necks down just before the turbocharger which creates a low-pressure zone in front of the turbo.  This low-pressure zone lowers turbo efficiency at "high load". 

Which Anti-Surge Ring:

1 x L5P Intake Horn Anti-Surge Ring (stock turbo)