Looking for a custom 10 or 12" sub box to fit in the boot of a 2005 wrx,

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I've only seen these on eBay. Unless you get one fabricated locally, but will probably cost you more.

Ensure the sub you use matches the volumetric capacity of the box for optimum sound.

using the Perth-WRX mobile app

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2005 WRX STI

The ones from ebay have generally been poorly constructed with minimal fibreglass thickness. My recommendation is spend the coin and have a quality locally built one to match your car and woofer.

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