how can i put a system in my 2002 chevy avalanvhe?

okay so i want to put a system but i want it to look nice...i got me a nice deck but i want subwoofers 2 of them but the problem is idk where to put them in a truck like this..because i dont want it to take up any of my back seats..i need them so is there any whay of putting subwoofers in a 2002 chevy avallanche without taking up my back seats any suggestions?
 
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