2015 SR5 CrewMax Sub/Audio Suggestions

I am looking to upgrade my audio from factory and need a few suggestions.

I want to put the sub enclosure behind the seats and looked all around but really couldn't find the needed measurements to ensure anything I buy would fit. I looked at the stealthbox but seeing how that was up near $1200 I was seeing if there was any other ideas you all had.

If anyone has done a complete build with sub, speakers, amp, etc. and can provide the total cost for me to get an idea of how much it would all cost that would be awesome.

 

On the cm you Have some flexibility..you might have to do the back seat mod.. Q-power offer some qbomb boxes check ebay for tundra qbomb I believe