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Hmmm, 2/0 for the battery to starter is an issue (getting into big boy crimpers...). My crimper only goes up to 1/0 (the amazon special).
If you were going to a faster spinning starter and you wanted ideal (starter only) I'd go up to 3/0. It's not necessary, I'm talking ideal and more towards those who are replacing the OE cables.
Soldering is fine as long as you don't let the solder wick up into the cable. The danger is if the connection heats excessively, the solder will melt. They do make lugs pre-soldered or have solder pellets of the correct amount.
Since you are going to replace the terminals, another option for you would be to go with a 2/0 cable battery to battery and not use the factory cable at that location. It would minimize your bolt ups. That would cost about $40 but you would not be buying the parallel crossover cable.
Also, remember that since you are changing the terminals, the battery to battery lugs need to be a larger hole, 5/16" or 3/8".
Since you are going to replace the terminals, another option for you would be to go with a 2/0 cable battery to battery and not use the factory cable at that location. It would minimize your bolt ups.
That makes sense, and is actually what I'll do. Thanks.