21" sub in my Trunk

[Ryan from Ohio]

Unless you got 150 Sq Inches of port forgetaboutit.

Build the box in the trunk and make the port external, like a separate box... Thats will give you enough room then, I think. Like the box could take up the entire trunk, then the port "box" could like connect where the seats fold down and take up the rear seat area. With that kind of port area the port will be long... So its gonna be folded up and probably the size of a 15" pair sub box...

Go sealed. The MF'er is still going to be loud. Sheer cone area will show you that.