Edit.....nevermind, Google that setup. Quality product with some great up grades.
Curious to see more details. Is this something like DOB alternator? I am not familiar with what the gt500s came with. The Denso 09 and up works for all. The cable upgraded looks great.
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The car needs a new alternator, factory one is 130A, I've heard nothing but great things about this unit. J2Fab also offers a 270-300A unit, but there's no plan for huge stereo upgrade or anything, we just wanted a reliable unit. The extra output is a nice bonus.
Some people like the PA Performance piece, it's cheaper and still offers a bump in output. I didn't like the upgraded wiring as much as this one. It's freaking beefy.