it varies from person to person. I broke 1 of the 2 bolts that are on the battery side of the engine block so i had to, uhh, modify my grounding kit. I didn't notice a difference in anything although my engine starts easier now (1-2 turns instead of 3-4 turns).
for $80, I replaced the small factory battery with a Sears Die Hard bettery to my GT - and everything seemed improved! Not only did everything seem improved, I can now blast my 500watt JL subs for several hours and it still starts on the first crank!
...try to get that out of a modification from adding a few extra $40 wires to your engine bay
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