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Nice work!! I am looking for another reason to redo my turbo kit, yet again...and I would love to try those manifolds....hmmmm....thanks for the pics! That thing should fly.
I have been checking into doing a single setup using both W-manifolds, utilizing a cross over from one into the other and then out of that manifold into the turbo. Seems like its made for it.
Why does the bottom one (pass side) have two outlets?
The LS4 is transverse mounted, the side inlet is for the front manifold to dump into the rear one via a crossover pipe. The more central outlet is for the single down pipe to the cat and muffler.