need HELP! asap!

[psykotyk 10+ year member]

some one please tell me how to install a blow thru when there is no box cover? how do i seal the box and everything??? and any ideas on how to make it look as natural as possible?

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[Bassin Buick]

check out some build logs on here and other forums. Hundreds of people have done blow throughs. i'm sure somebody took time to do a build log.