I have some stuff for him lolare the subs to much or not enough? unless you can eliminate your back seat, your options are limited for a large sub. try a 10''or 2 and keep the amp.
It will fit fine in that box you sent me a pic of... only needs like 1.9 and that was 2.5That he does.. he has a little 8"er that I want...... I think the 12 wont fit properly due to the size of the box needed...