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Hi All new to the forum. Just started audio upgrades for my 2021 Accord. I am running true 900 RMS 400 to speakers and 500 to sub. I'm wondering if anyone has performed the big three on this gen.

I have spotted the negative battery to chassis (easy 12 inch run) and the positive to the alternator. The one I can't find is the engine to ground. Anyone know on a 2.0t where that is?

If someone has done the upgrade did you leave the stock wires on? I see the alternator positive has some sort of sensor on it. Am I asking for trouble running a separate wire for the big 3 and leave the stock positive on?
 
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