How can you tell audiophile?

[hackdevil]

I just bought an 04 xlt explorer. how do i find out if i have the audiophile jbl system in my car? and if i didnt have it, would buying the whole set (4 speakers + amp/sub) for $100 be a good idea. I want a good full sound something that i can cruise to, but I dont need to go all out booming. what i have now isnt very full sounding