The evil that is the SSAC manifold...

[Notchbackca]

in a double Y configuration like that to be in anywa efficient, the cylinders that are merged need to have their power strokes 180 degrees out of phase, for this to happen you would need to have 1 and 4 merged and 2 and 3 merged like the stock manifold, tho the stock one has its own collection of problems

[Myetball]

IMO that's not entirely true. The reason headers are typically designed with a 1-4 3-2 design is to assist in creating a vacuum in the exhaust system. The gas from #1 is still moving through the pipe and creating a small amount of vacuum behind it as #3 exhausts and so on. If the cylinders exhaust out of phase the vacuum is reduced or eliminated causing static air or back pressure.

Since the turbo is only a few inches from the head on the SSAC header, it shouldn't affect performance or spooling to a noticeable degree. The turbo is still going to be fed exhaust from each cylinder in turn and the short length of the header won't cause the exhaust gas to become static.

Heck, log manifolds aren't pretty and by no means are they in phase or equal length....but they get the job done up to a certain point.

Would a phased equal-length turbo header be more desireable? Of course it would but for the price and the limited affect the SSAC will have on performance, it's definately a worthwhile purchase.

HOLY BID MADNESS BATMAN.....I just checked and that SSAC is up to $360 with over two days to go. I certainly hope they make more so the price can come down.

[Notchbackca]

equal length is better as you still have scavenging (the first blob of stuff you said), and the pulses are closer together at the collector