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AMS Performance Subaru EJ25 Intake Manifold - Uncoated

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The AMS Subaru Intake Manifold was designed to outperform the competition. We referenced many modern design examples and engineering studies to bring you the best intake manifold available for the Subaru EJ20 and EJ25 WRX & STI. After extensive testing we ended up with a manifold that makes more power than anything else currently available on the market! Benefits 4.5 Liter Plenum Volume 13” Equal Length Intake Runners (Measured from Face of Bellhorn to End of Runner) 2.5” (63.5mm) Intake Runner Diameter (ID of Bellhorn) Bellhorn OD 3.8” (96.7mm) TGV Housing Replaced with Long Runner Design Increased Port Size at Cylinder Heads Allow Matching to Larger Hand Ported or CNC Ported Cylinder Heads