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Going to 1 or 0 gauge will be better and is actually recommended by pretty much everyone and that is what the better relo kits usually come with. You will see less loss, you will see less temp if you get into a heavy cycling situation, and the casing is usually thicker on 0 than 4 so it give the additional safety of resisting chaffing better.
There will be no performance gain, just a better way to achieve the same.
-Tim
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