Do you think that a 2.3 intake manifold an TB will improve my 2.4L auto performance and hp???

Well, I'm surprised that nobody has answered him yet. I guess I will, yes it will improve your hp and tq. Because the HO Mani and T/B allow better air flow thus giving you more hp and tq.



My car has two speeds, fast and faster.

Well,
If your going F.I. then yes it will more than not.

If just on an N/A car no mods or anything, think of it as like a regular CAI/WAI.
Just with a grumpier sound.
And it looks pretty good under the hood.

When I had the mani strickly on my auto, going uphill the car didn't bog as much.
I was actually abot to pass folks with less effort.
-M



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