what size box for 2 15 type Rs

Okay I think im gonna go with two 15 inch type Rs(2+2) to wire down to .5 ohms on the VLX-25...This is all gonna go into a chryler LHS So I need to move alot of air...I plan on going into local comps....So the box I want designed for SPL but can Hit alot of everyday music(rap) for all other music prob turn subs off...What do you think these subs could hit also with the back seat out for comps.. What box Diamensions should I use and what size ports? Jay

i'd make the box atleast 6 cubic feet internally.  the port can be determined by looking in the sub manual it gives the port it requiresIf you say "I already know how", don't ask me a single question.

These subs were designed to be run in a sealed box, its hard to get a smooth ported box.  For best results for spl, and some sq, go for 3 cubic feet for each sub individually.  With that size of box, be shure to use braceing as these subs will break stuff if you feed them more than the wimpy rms rateing alpine gave them.2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.

Yep now I got a VLX-400 just bought it so I need to do something that can take the power!! Jay