If you can't put your finger down inside the cross-over, then you do not need to seal the "pocket" in the cross-over as it is already sealed.
If you CAN put your finger down inside the cross-over, then you need to seal the "HOLE" in the cross-over as it will make noise and leak exhaust fumes into the engine bay.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
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