2x 15" Kicker L5s 2x RF 1200W amps. Box specs for noob?

[twiztid_beats]

I'll probably sound like an idiot after reading some of the stuff on the forums but here goes.

I have two 15" kicker L5s running off two Rockford fosgate 1200W amps (Overpowered I know but hey they were cheap.) With an Epicenter indash. They are going to be in my 03 Yukon Denali and to be completely honest I have no clue what kind of box I need. Ported for sure but besides that I have no clue. I know only the electrical side of Subs and what not but as far as boxes go I'm a noob. I already have the wiring and everything done right but as of now the subs are in the crappy prefab boxes you buy from the flea market and such. They hit but nowhere near their potential. Any help would be greatly appreciated. My father in law is good with measurements and such so If i can figure out what I need it'd be easy. Everything I've researched has been for just 1 of these subs.

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[LosIsATool 5,000+ posts]

6 cubes net per 15 ported, 90 sq inches of port per sub, tune at 35hz. Square subs need a box one size larger. Kicker only puts that in the fine print. Having more power is good, most of us run double rated per driver, don't mean it sees all that power all the time, you can always back it off and have headroom. I wouldn't use the epicenter, they can fry stuff if you are not careful.