I have been online for days doing sub research. my current system is bose factpry with avic head unit. I already have dual optima's and a ho alt. I just want to clean up my sound not rock the block. This truck's going more for speed with nos upgrades and bigger engine. I am wanting to add a sub. I want to start with a cheap ebay box. I am going to make sure it's well sealed and seal it with epoxy or liquid nails http://cgi.ebay.com/CHEVY-SILVERADO-EXT-99-06-CUSTOM-12-INCH-TRUCK-SUB-BOX-/330590849981?pt=LH_DefaultDomain_0&hash=item4cf8c00bbd#ht_1598wt_1392 then install a fi sub torn over 10 or 12" the 12 looks tight on mounting depth https://ssl.perfora.net/www.ficaraudio.com/sess/utn154e262b8ca6bcd/shopdata/0050_Speakers/0045_X/product_overview.shopscript then a hifonics 1000wd amp maybe a little too much???? http://subthump.com/Car-Audio-Products/Amplifers/Hifonics-1000W-Class-D-Monoblock-Amp.html This was the best possible combo I could find within a reasonable budget using quality stuff. it's going into this with avic and bose sound a little about my truck Uploaded with ImageShack.us Major work 07 front end shaved roof drop spindles 22" cragar rims minor bolt on's for now I am going to be spending the summer updating overhauling this is my project truck now. Painting the entire mirror assembly, bumper step pads wiper cowl and remove the ant. led lights or hid in everything dash signals lic plate every one brakes ssbc ordered and gathering hydroboost parts. Putting my NOS kit back in with warmer, purge and remote opener. Stereo new back up camera and adding subs to my avic.