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Just cut down the lug. Also use a thinner nut, no washers and maybe sand/narrow the round end of the battery cable.

that's another thing I did used a narrower nut and replace the cable end with a copper one ,they are much tinner than the stock one you have.you can aklso just grind down a nut to make it tinner,just make sure you face the unground side down.I HEAR YA ABOUT THE HEADERS.