Is this true regarding the stereo?
 

I have a 99' with the M490(Hi-Fi) and rear speaker kit. I'm going to put in 4" MB Quart coaxials in the dash. I was concerned with the size of the crossover for the MB Quarts as I wanted to hide them in the dash but they measure too big to fit down there. A member here informed me that since I have the Hi-Fi option that I already have a crossover at the factory amp. Is this true?