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JDM TGV Delete - Top Feed
TGV delete intake manifold risers. American Subaru turbo models come with TGV (Tumble Generator Valves) to improve start-up emissions. However, they cut available air flow through the intake manifold by up to 50%, reducing overall efficiency, and reducing the amount of air larger turbo upgrades can flow through the system. These are from the JDM model, which did not come with TGV's.
08 STI requires no slotting, but needs a fuel rail kit.