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I guess the question is why? Is it just because there are more options available?
There is no need for the additional extension as you have an 8" woofer right under your ass that provides plenty of mid-bass and you can easily cross the 4" and an under seat woofer around 200hz and have nice integration between the two. Also, when you cross over a 4" driver at 200hz it's going to have considerable power handling. Lastly a 4" driver will have better off-axis frequency response and in the door of a car, that is exactly what you want.
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