Ive got it. Though mine tucks in behind the rear seat (cc). With 2 10's and the JL 250 mono block amp, it thumps much more then what I wanted Ive got the bass turned almost completely off on the H/U just to keep the truck from rattling apart. It was pricey... Just under $1100 bones for the amp and sub box.
the only option you really have in a ext cab is a under the seat box. i had a soundoffaudio box in my z71 with a 12" JL sub and it sounded good. i think the jl boxes are nicer because they get the right amount of air space need for the specific subs. if your wanting the best i would go with there box. if your wanting still a nice setup but alittle cheaper at a look at http://www.soundoffaudio.com/items....ES/cat2/CHEVROLET/Cat3/SILVERADO EXTENDED CAB
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