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They offer varying degrees of improvement you need to decide personal preference. When doing so there's a few simple things. Open Box or Closed Box.
Open Pro's:
Blow off noise
Better airflow then stock by far.
Open Con's:
It's open to the engine bay so unless sealed with other options it will take in some warmer engine compartment air.
Closed Pros:
Sealed structure little to no warm engine bay air.
Better airflow then stock by far.
Closed Con's:
Closed you won't be able to hear turbo blow off if that's your thing.
There's probably more but remember the age old adage more airflow to the turbski the better for the turbski.
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