Genuine Crawford Performance ported TGV's are a professionally ported for a perfect fit for your side-feed or top feed injector applications. Not only do we delete the 'TGV' flapper valves but we remove the metal air restrictor that slows air flow into the engine while professionally porting the TGV for a cleaner and smoother flow of air into the engine.

Called 'Tumble Generator Valves' by Subaru, these are common in many vehicles and are used to help emissions under cold start conditions. When closing off a significant portion of your intake and tumbling the air flow pass the injector the air at idle and low loads it will improve emissions but hurt the throttle response of the vehicle. For race applications this is one of the best modifications that can be done in order to improve throttle response in and out of corners.