I have a 25ft roll of KnuKonceptz in the CCA but need OFC because of the amplifiers he wants to run since the CCA is only rated at 200 amps they claim. At this point welding cable or car audio 1/0 OFC will work just w/e is cheapest. I've used Welding cable in the past, when I worked at Mack I got a 50 foot roll of it for free in 1/0 but that is long gone, stuff worked great.
FYI he wants to run a 3K Taramps and a 4 channel amplifier as well so figured OFC would be a safer bet then something that is only rated for 200 amps like the KnuKonceptz I have sitting in the basement. He has his big 3 done in 1/0 OFC already but that was ages ago and has none left over and a alternator upgrade to his Trailblazer. But told him I would help with the install since I have all the crimping tools, connectors, ferrules and tool so he doesn't have to buy all of that stuff