[Shehadehd]

Originally Posted by The Radium King

the flapper on the 987 plenum actuates at different rpm than the resonance flapper on the manifold. if you search you can find a description of the activation points. also note when you look at the ecu pinouts that the signal for the plenum flapper comes from a different pin than the signal for the mainifold flapper, which would indicate that it's triggered at a different point.



otherwise, the boots that join the plenum to the manifold are rubber and have enough give to fit a larger plenum - no need for adaptors.

Ive seen that the plenum flap has multiple unique activation points. My hope is that triggering it with the resonance flapper may still provide some gain though the intake tuning wasn't designed for it. Happy accident?