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It is indeed a resonator. I don't see how it can smooth the air flow to the TB as the tech on the SR20DE forum said.
To block it off, go to your favorite auto parts store and ask for a 1 5/8" Expand-Tite. It's a rubber plug with a large washer on it and a bolt through it. When you tighten the nut on the bolt, the rubber plug expands tightly into the hole. Put the OEM clamp on the intake pipe before tightening the nut.
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George Roffe
Houston, Texas USA
00 328i
91 SE-R (well modded)
84 944 SCCA ITS race car under construction
"I fear all we have done is to awaken a sleeping giant and filled him with a great resolve"
-- Admiral Yamamoto, December 7, 1941
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