I was thinking thinking of installing 2 amplifiers to upgrade the audio system in my 2019 Honda Fit EX. I've heard that a 'Big 3 upgrade for the alternator which consist of replacing the stock wires from the battery to the alternator and the alternator to groud with a thicker gauge that wouild allow for current to flow more efficiently. Has anyone ever done this to they're Honda Fit and if so what were the results? I'm also going to upgrade the battery to a 51r AGM as well.

Thanks

 

Always keep OEM wires. You add larger gauge (preferably OFC, but I won't get into that) wires.