help with speaker selection

[makemysoundwork]

i own an isuzu rodeo and would like to replace the head unit along with the speakers...i'm looking to spend around 400 dollars at the most...my car fits a 5 1/4 in the front and 4 in the back and i was wondering what's the most kick i could get ..im not considering a subwoofer because i need the cargo space...can anyone help me with a setup...i want more bass! thank you!

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