2000 crown vic just got it.

i just purchased a 00 crown vic police interceptor with 120xxx miles on it. Where can i find online a new intake manifold, i want to replace the plastic one with a metal based one. I looked on autozone's website and it showed the plastic one. I just want to get it out the way before it crack's on me. Or do i have to make a trip to the dealer for that part. Also about the interior, the floor its the rubber-rized feel one. How would i go about getting it replaced with the carpet. Will it be costly or a pretty good price.

thanks for all the good feedback to my questions.