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Imagine your engine like a bottle neck. With an Intake, Headers, and Exhuast you open up the big areas, but the manifolds are still constricted. With Stage IV's, you take away the bottle neck. Make sense? Search for them and you can see what kind of results people have seen.
 

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Looking to get a few more mods done and have read about these by NGM, stage IV or somethig. Insight?
Improves engine's ability to breath. Most noticable at higher rpms where the engine is trying to flow the most air.
 
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