Bat Terminals.

stinger, knukoncepts, rockford fosgate, sky high, and generic ebay all have similar options to what you are looking for

What are all of you using for battery terminals? i need one with atleast 1/0(or bigger) input, 1(4awg), and one or two for factory small wiring.

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man i have some great knu terminals, they great because they're "low profile" and have covers but omg they a pain to take off.. the screws are on the bottom so u have to stick all wires in it tighten them then mount it onto battery and the allen screw is very low on side each one takes me about 5 mins to get off be cause it's so close to other stuff.. anyway i'll show u those in case u have tons of room around your battery, if not get some gp audio 4 or 6 spot terminals others similar to those everywhere.. this is before i added big 3 wires

oh forgot those have 0ga 4 ga and 8 ga and the screw on the side for a ring terminal

Just saw this last week which is a great option if you or anyone else doesn’t want to cut off the stock terminal.

Replacing sophisticated stock battery terminals - Car Audio | DiyMobileAudio.com | Car Stereo Forum

Plan on running a 2nd battery as well. Any recommendations on which? Also looking to add an isolator. Sonic has this. https://www.sonicelectronix.com/item_28365_The-Install-Bay-IB500.html?from=701
Looks like a good one.

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You don't need an ISO unless you play a lot with the car off. With the car running the ISO is bypassed.

Toolmaker for terminals

Onlinemetals.com, order some aluminum 6061 and put some holes in it.