8+ Switchblade Turbo. These knives are banned in. Also i have never heard of a switchblade turbo.
The vane opening decreases the exhaust back pressure letting the engine to take advantage of the larger turbine housing and breathe more efficiently. The switchblade turbo is available in several versions to suit varying levels of production complexity. Automatic knives (also known as switchblades) are spring loaded, side opening knives.
