What crossover should i get for my subwoofer?

I've got a 200 watt mtx audio amp hooked up to a single pioneer 12 rated at 1300 i believe. All in a stock radio (I know) Im saving to buy a sh!ttier looking version of radio looks. Lol

I need to buy a crossover for it so that no soud comes out the woofer, only bass. But i see so many options and price ranges. SUGGESTIONS?

Ford focus 2013
Added (1). 4 ohms

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