TGV delete intake manifold risers. American 2.5-liter turbocharged 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 turbo models, which did not come with TGV's.
These are off the car ready for install