AVO Turbo TGV Delete KitMost modern Subaru models are equipped with a TGV assembly, short for Tumble Generator Valve. The TGV assembly includes a flapper valve designed to create a tumble effect in the incoming air, which aids cold start emissions. However, this feature is unnecessary once the engine is warm, and Subaru models in regions like Japan are often built without it. Even when fully open, the TGV flapper valve significantly restricts airflow, limiting engine