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From what I seen, the JS manifold is well short of optimum. It makes more power than the original manifold. Not because the JS is particularly good, more the standard manifold is particularly bad.
The primaries are way to short for decent torque at the kind of RPMs the KV6 can muster.
The finish on the standard manifold is dire. Just look at this collector. The JS has to be be than the standard manifold.
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Ex ZS180 Owner and fan.
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