Depends on what you mean by stock system
YES
its the same year round
Cant you need a amp or you will blow the battery
No it will not damage sub unless its raining or something.
Woofers
Of course!
You cant just split the wire you have to go to your everyday audio store and get a step down
200 watts
Best Buy and other electronics retailers stock Pioneer sub woofers. The can also be found at Amazon and other electronics retailers on the internet such as Overstock.
One can purchase car speakers and sub woofers from most car accessories stores including Halfords. They can also be purchased online at Argos and Amazon.
you have to get an amp, crossover or an amp with a crossover built in and all the gear to install it like speaker wire power cable patch cords remote wire bow for the subwoofer that will fit the truck
No, but it is nice if you want to play loud music.