Drop in sub upgrade for factory Alpine system

[Wet Willys]

Has anyone had success with a drop-in replacement sub in the factory Alpine system? The factory sub isn't bad, but I'd definitely like a little more punch, but without having to go the whole custom box and and amp route.

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[Dqban]

Very limited space. Only thing i could get to fit was an earthquake sub but its not much better if at all. Box is just too shallow.

 

[sicmadek]

You can try adding some polyfill to the factory sub enclosure. If that doesn’t satisfy you then try a shallow mount sub from amazon.

 

[Dqban]

Most shallow subs dont fit. There is only like an inch+ towards the top part of the box. Infinity and earthquake are the onlyones i could find that fit. They only handle 150rms

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