For people with blow throughs

[supermaxx123 10+ year member]

Just wondering what is the typical cost to make it a blow through. Talking about materials and not speakers. I know you need a gasket but are there any other expenses involved? Also difficulty level, how hard is it? I've got an old 92 s10 that i hardly use and might want some more bass than just my sa8, just because. I'd also need a cover and i'm hoping that would be the most expensive part.

Thanks

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