Need help!!! With Aftermarket radio.

Hi guys,
I have a 2000 explorer xlt with rear subwoofer. I have just purchased a pioneer avh-p1400dvd head unit with HD radio receiver. I was also given the relay for parking brake. my question is what all harnesses or "mods" do I have to use to run this unit with my factory sub and all?

A reputable vendor should have given you the option to purchase all of the adapters with the HU. I believe you will need a double DIN install kit & wiring harness adapters for Ford.

i purchased the hu from a friend of mine. who had a 2008 Taurus, so I will have to purchase them separately.

Check with crutchfield they can hook you up.