Quote:
Originally Posted by Jordo!
If the diameter is the same, but the runners are longer, you won't pick up power at higher RPM's, although you should gain some in the mid range. Looks like that's exactly what happened. With tuning, you should get back what you lost up top and break about even.
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You've stated this before, I don't know what makes you think you can just "tune" the power back here. Modifying timing and AFR any further than what has already been done are not going to get any more power out of this, with or without the manifold. Regardless, even if there was no top end loss, there are no gains to speak of (~5 tq for 600rpm)