I bought a 2007 Mustang GT and I would like to replace my speakers. I want some Alpine Type-X. My problem is that I need to know how many amps my stereo system can stand. I have read all the specs of what the shaker 500 can hold and the Shaker 1000 can hold. i just do not know which one is in my car. There is no Label on the top of my radio that says... "Shaker 500" (wish it would). Please help.