Or just fill it with something like sand, and measure the volume of what you added. We did this back in the day for spare tire well sub enclosures to calculate volume.
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Six speed 2000 Boxster S
Arctic Silver on Metropol Blue | LN Dual Row IMSR | Arctic Silver console, spoiler frame & bumperettes | Crios mod | Technobrace | RoboTop module & modified convertible top relay for one-touch roof operation
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