IIRC, TylerTron has a Cavalier or something like it. He is in the process of doing a wall with 2 18" XLs and put one XL in the trunk with a box he built. The sub blew from the small box.
I would do level 3s off of the 1200 watt amp. Rusty said 1500wrms is optimal for 2 level 3s.
How low it gets really depends on the enclosure..of course fs counts too though. It shouldn't be a dramatic noticeable difference of how low it gets though.
Thanks for showing me this car! I just called the owner and its practically sold to me.
Haha..jk It has a good price for the mileage. Then again, its a stick which is usually cheaper. Its a few grand less than the KBB value