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You can spend a lot on wire, however in my experience Knu Konceptz or Kicker are the best bang for your buck. 4 gauge will suffice nicely, just make sure to match the fuse of your amp with the fuse of your wire.
I got 0 gauge kicker wire kit yea it was like 100 $ but it makes a huge difference. Alk my friends have janky walmart brand junk. Get the good kit you wont regret it