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I would leave the original ECM in there. The swap to manual means that the computer will not flare the idle up between shifts, so it may drop just a little low instantaneously. This may or may not be that noticeable. But the manual computers drive the AIS so that the idle doesn't sag when you push the clutch in to shift.
Going from auto to manual, you will notice a definite increase in power to the wheels. And it's more fun. And you can push-start it in a pinch.
Going from auto to manual, you will notice a definite increase in power to the wheels. And it's more fun. And you can push-start it in a pinch.