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Exhoust output on 22R

PostPosted: Sun, 02 Jun 2019 5:18 +0000
by ackky
Hi, I have been searching on the internet and not had much luck so I am hoping someone here can tell me. On the 22R - 4cylinder 2.4L petrol motor there is a large hole in the back side of the head - drivers side. (No. 4 Cylinder) There are 3 bolt holes around this hole.
I would like to know what is "missing" as the engine sounds like it has a hole in the exhaust manifold....and of course the "loud noise" drops off as soon as it is covered.

Thanks in advance.
Ackky.