Re: new battery box
I would caution you to be very careful with a metal battery box, and keep in mind that whatever you use an insulator needs to withstand the thermal cycles, high temperatures, and vibrations of the engine bay. That being said the result sounds like it will look cool (not my cup of tea but to either their own). Post pictures when your done (or sketches of the concept). One thing to consider while doing this is some kind of ventilation for the battery, a way of bringing in cold air from below where the stock intake is/was and up thru the battery box would help prolong the battery's life.
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