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1997 Civic Hatch D18Y8 M62 S/C
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I'd say it depends on the condition of the Y8 head you're putting on as compared to the Y7 you're taking off. If you did a valve job, mild port, and port matched the Y8 head to your Y7 IM, you should feel a gain. Most definitely when VTEC kicks in but don't expect your neck to snap back.
 

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the y7 will not be the best choice. you can pick a y8 up on ebay for $20-$40
 

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Almost anything is better than the Y7 IM. It will be a huge restriction!
Y8 or Z6 manifold will be much better. Z6 might be the best option, if you're to believe what some say.
And use the Z6/Y8 injectors! The Y7 only has around 190cc injectors, while the rest of the bunch has 240cc.

On an otherwise stock Y7, it's said that switching the IM has a noticeable effect.
So I will assume it will be even more so with a Y8 head.
 
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