need advice two 8"s or two shallow 10"s

[Matt Brua 10+ year member]

So I am tossing around the idea of adding some subs to my 10 tundra dc. I will be using the under rear seat space for the box. the thing is the box will not be deep aprox. 5" subs firing up if a 10" is used. Or go the 8" route and have them fire forward, but im not sure I could get a sa-8 to work due to its mounting depth, so I would need some suggestions on subs. For the shallow I was thinking Polk MM but I have never heard a shallow sub in person but read they lack output. For a 8" I was considering a ID8v3. I am up for any suggestions and the box is going to be a sealed unit by the way.

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