How is everyone hooking up and amp and sub to the stock Bose system. Are you tapping into the rear speakers and using a high power input for your amp? If not where are you getting the signal for the sub? Let me know if you can.....Thanks

 

They make a line output converter that works on all factory radios. It taps into you rear speaker outputs from your HU. THen it converts that to a RCA output. Its costs $25-30. It is made by AudioLink. You can get it from crutchfield or any local car audio shop.