The stock M90 vacuum cap (often called a vacuum tree) is constructed of plastic and always breaks over time. Our ZZP M90 vacuum cap is made of cast aluminum and post machined to last the lifetime of your 3800, and look great while doing so. 

Featuring 3 ports all identical to stock location and specifications, just remove your stock cap and drop the ZZP aluminum unit in place. 

Fits: Gen 3 M90 and Gen 5 M90 superchargers.