Help with Big 3, Gauge Size

[Snyperx 10+ year member]

I am looking at doing the Big 3 to my 2010 Mazda 6, but not sure which gauge to go with. Should I do a 4AWG kit or a 1/0AWG kit? My system will only be using a 650W amp @ 2 Ohms. The amp requires a 4AWG hookup. I probably don't even need the Big 3, but would be nice to have it done. Thanks.

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[mylows10 5,000+ posts]

Actually the big 3 is need on most cars. Especially the Japanese and European cars the stock wires on these cars is usually 8 gauge or less I always use 0 gauge

 

[Josef344]

I use 4/0 OFC.. But I personally love overkill.

Go for 1/0 gauge.