Originally Posted by
MaxPower
Your talking about a Heat control valve integrated with an EGR. Most EFI engines do not use these. Thats real old school from what I'v seen. Mostly designed for carbureted and throttle body injection systems.
Most all of them I've seen have used carbs. But it still exists, and in major quantity. The system depends completely on the vehicle, and manufacturer design. Some vehicles basically won't show gains. Others, will pick up some pretty good #'s.....