FA20 Billet TGV Deletes | Roo RacingUnrestricted airflow. Built for boost. The factory TGV (Tumble Generator Valve) system in FA20 engines is restrictive by design. It uses butterfly valves in the intake path that become a bottleneck once you start pushing airflow especially when you turn up the boost. Roo Racing FA20 Billet TGV Deletes replace the entire TGV assembly with smooth, CNC machined billet aluminium blocks, removing the internal valves completely and creating a straight,
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