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ok i give up everyone sells interestate but nobody sells the battery i need...the MT51R.. some places sell the size battery i have in Die Hard brand is that just as good?? I dont know what else to do but i heard AZ and AA batteries suck
Go with the yellow top. If your going to spend on a new battery, don't get somthing cheap, especially if you have a system hooked up. Optimum battery would do you good, especially if you have a JL 500/1 amp.
Also, look into NGK Platinum plugs and and NGK wires...