subs behind the seat of an Screw
 

I have a 2001 f-150 supercrew. Im looking to upgrade my audio system. I was running two tens under the back seat. But being a typical guy I want more. So am getting ready to start a new audio install project. Would like some I sight and feedback on this to anyone who has had past experiences and so forth. I am looking to add a total of four 10" subs into my truck. Im thinking of putting them all behind the back seat. I know I will have to remove the back panel and make a custom box. The speakers I have that I want to install there require a mounting depth of 3". Required airspace of .35 per speaker. Rms is 300watts per speaker. Speakers are low profile. I would like to know if there will be enough room to do such an install. (Keeping the backseat functional). Also if this is possible how will this sound. Amps will either be mounted under back seat or maybe an added casement of some sort above the speaker box under the window. Any insight will be greatly appreciated.

I put a factory F250 sub/amp in my back wall

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Sick set up... Just wowed by that, sick wicked... How does it sound..? Enough air space for full sub capacity..? Or would is sound better with two subs removed and holes capped..? Either way, looks narley...