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Technically, the intake manifold is dual stage, because the high lift cams stay the same from the initial VTEC engagement all the way to redline. The only thing that changes is the IM. Your numbers are a little off too, 4.4k and 5.8k. But you've got the idea.
If you switch out the IM for a single stage one, you'll get an engagement like a B16 or B18C5. It'll engage earlier than those though.
you're exactly right..... vtec did not kick it at 4.4 before after market IM
You don't feel it as much in a GSR because of the dual stage design. Its used to get a much flatter torque curve, so you don't feel the big kick like on a B16/B18C5.
Originally Posted by Sherdog9
you're exactly right..... vtec did not kick it at 4.4 before after market IM
It kicked in at 4.4k before, you just couldn't feel it.