There shouldn't be any port noise. And as far as freq response goes, you will just have to see what your vehicle produces.
Your vehicles acoustics will be the determining factor in your overall freq response.
Have you talked to anyone that has the same subs you're using to see what they have tried and what works best?
Before you decide on a final design I would ask around. Some subs can be very picky with ported enclosure designs. I'm not familar with Pioneer subs and how well they do in ported applications.
I'm only telling you this because I don't want you to build an enclosure that you're not going to be happy with.