yup, its half of a Honda GSR intake mated to half a d15 3 stage intake.
heres a pic of what inside the plenum looks like.
And a little infor on the STOCK gsr intake, should be pretty close to my final runner length and volume though. However I am making my own plenum to mount onto the butterfly assembly
"The square intake runners, which are setup for low & midrange power (<5800rpm), measure 34 x 29.5 inches in size. They hold roughly 325mL of air, and are 305mm in length. Remember: LONG runners are better at LOW RPM.
The circular intake runners, which are setup for high-RPM power (>5800rpm), measure 43mm in diameter. They hold roughly 100mL of air, and are 249mm in length. Remember though, when these are open, you get the combined volumes and diameters of both sets of runners. Remember: SHORT runners are better at HIGH RPM.
The total volume of the manifold is roughly 1700mL. Compare that to the volumes of the Blox and Skunk intake manifolds that are 50% larger (2400+)."
The larger secondary runners will activate around where peak torque is made, 5000 or so, will dial it in with the dyno
And the intake won't be done before the inital dyno and tune so I can get some good before and after numbers. The purpose of my frankenmanifold is to up my midrange torque to aid in real driving situations.
