Yeah basically a reversed flow 4-2-1 header only without the 1 part. I personally think it would be easier to tune since you dont have to focus directly on the wave reflections and can just try and get the pressure buildup to be timed correctly for when it opens and then worry about wave reflections for right before the valve closes. Only thing is that the number 1 cylinder is going to open a lot longer after 3 closes then the other way around so 1 and 2 may not get as much of this pressure charge but there gotta be a way around it. I may look into having it work off cylinders 1-2 and 3-4 then have the runners be a little longer to account for the increased wait time. I figure using a 40mm TB for both cylinders would be fine. This would work best with long duration cams that arent closed for very long and open very close to each other. Any more thoughts?
Brent