if you use a line level to run your amp off of the stock radio you will have to understand that it will not be putting out the volts that a aftermarket radio would and in return your amp will not be as loud or sound as good as it could if you would just put a after market radio in

 

im thinkin of just goin head an getting a aftermarket cd player cause all of the signal converter i looked at said they where for tvs an **** im not sure reallywhat i should be lookin for