maybe asking a stupid question.. but a Zenclosure premade box would be useless for something this powerful yes?

 

yes

 

two w7's? ummmm.......have you heard two of em before? hahahah doood thats hella loud. i previously owend a 10w7 running off a 500/1 in my 04 xB and boy did it prove me wrong. ya w7's are overrated and now if i had to do it again i would run w6's but dood trust me, one w7 is plenty. to give you comparison i also ran a 15" kicker L7 off a Hifonics 1606d amp and ppl would say it was a close match up to the 10w7. ya they hit different notes but jl is awesome. i would highly recommend one good jl sub and amp. also good wiring of course and a capacitor. whatever you decide on post pics and info about it, interested to see how it sounds as i am getting a Z soon.