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For those with the Entry Level 5psi Supercharger System for their 1986-1993 Fox Body Mustang that are looking to turn up their boost pressure, one thing that must be added is a Bypass Valve. The easiest way to do so is with one of our Bypass Upgrade Kits. With this package, your air discharge assembly will be upgraded to that of the H.O. system, with a Standard Bypass Valve that will support up to 10psi, and available with or without the required aluminum discharge tube (available in both Satin or Polished Finishes).