I usually use JB Weld to close them up. Been running a Performer that way for about 10 years now.

Mix up half a tube each, pour it in one side, tape off the opening, set the intake so that the taped off opening is setting on the workbench, let it harden. Use the remaining JB Weld on the other side once side one is done, remove tape, install.


They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.