What kind of sub is that? It looks like a Lanzer. I thought you had bought a J.L. Audio sub.
This driver here is a bargain and has gained a great reputation if anyone is interested. http://https://www.parts-express.com...eaker--264-919
Are you going to build an enclosure for it or just mount it in the trunk? You may want to cut out a baffle that fits into the bottom of that trunk to secure the woofer to. I don't know how stiff the bottom of that trunk is, but you definitely want the bottom where the speaker will be mounted to be stiff. Flex will rob your driver of output.