This will require some thinking, but I'm going to make it work.

Im just trying to work within the parameters.
A single ported 12 needs about 2.5 cf net to have the gain on the bottom end that he's looking for. After displacement and port your looking at 2.8cf ish and behind the seats of a tacoma simply does not have that. i fully hear what your saying, and in all worlds is true, but in this situation there is very limited options and more power/adding another small amount of filler is about it. Sealed these subs can be run up to 1500wrms each without to much trouble so he can easily double his power

 

I have an access cab so I don't know the exact measurements but if I could get that (exact measurements of double cab space) I can try to model something out...it would give me something to do in my spare time.

My direction on this would be along the lines of an external port. Is there a pdf somewhere of the t/s parameters for the subs zman is using?

 

yeah i can get you the TS-specs. AN external port would be a must!