[infeltrate]

I saw this hole in my intake manifold. It has threads in it and it looks to go all the way through. I was thinking of capping it off. unless something is supposed to be there? Might cap it with a screw

 

[09CivicSiBrian]

It is not a hole if it has a bottom... but it is probably for attaching a bracket or cover on another application.
B

 

[JEA86]

its like that on all si's no biggie

 

[Budzinski]

its not a hole.. it has a bottom.. probably used for a braket or cover for a rsx or tsx.. leave it alone unless you wanna put a bolt in it but it will have no affect..