A bone stock 6 speed will hold your 600 hp, but you'd want an Exedy twin plate or equivalent clutch. They hyper single will hold the power, but it not especially street friendly. I would not recommend relocating the battery; the cables you have to run cancel out the weight savings of the smaler battery, it's more of a handling mod which, frankly, isn't going to be noticeable in such a heavy car, stripped interior or no.
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FWD is the new AWD
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