I'm sure that if you are thinking of adding it to a 2007 Solara, it probably already has the amp - so to answer my question, Why?
If you don't have the JBL system, it probably won't work.
If something happened to your amp, then replacing it might work (or if someone stole it perhaps??).
Just trying to figure out exactly what it is you're trying to do to see what you have to work with to answer your questions.
