Take it back or at least call them .
Ask what they did to it . Looking at it doesn't say much about it.
If its a US car made before 09 it will be HI FI or L7.
If its a 06 330 it will be L7.
Did they work in the rear area of the car where the amp is at all?
Did they do any programming on the car ?
Last edited by ctuna; 01-11-2013 at 02:10 PM.