i wanna add subs too my cadillac deville 1999 ... but can i use the stock stereo...

after market is the way to get and make sure you get some new door speakers too your going to need them if you get after market i highly recommend pioneer deh4900 or higher
 
You can if you buy a line level converter and simply run tag lines off of the rear speaker wires. But to achieve maximum performance and sound quality I would recommend an aftermarket stereo with RCA outputs and a professional install. Or at least someone very knowledgeable in car stereo installation. Good luck and happy booming!!
 
go here and buy a system for cheap

http://www.onlinecarstereo.com/CarAudio/ProductList.aspx?CategoryID=18&AttrID=1&AttrValue=12&RowIndex=4&PageNum=4&SortField=1&SortOrder=0&ShowAll=False&

Pioneer TS-W308D2Pioneer TS-W308D2
12" 1400W Dual 2 ohms Subwoofer for $70 each
 
go here and buy a system for cheap

http://www.onlinecarstereo.com/CarAudio/ProductList.aspx?CategoryID=18&AttrID=1&AttrValue=12&RowIndex=4&PageNum=4&SortField=1&SortOrder=0&ShowAll=False&

Pioneer TS-W308D2Pioneer TS-W308D2
12" 1400W Dual 2 ohms Subwoofer for $70 each
 
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