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1,558 Posts
on my last chevy 4x4 i had to replace my plugs and bought just the regular ac delco plugs with new wires (not the bottom of the line but surely not the top, somewhere in the middle) and my truck ran 50% better than it did. as far as performance i wouldn't see where spending 6 bucks a spark plug is worth the actual gain you get. my cousin had a mustang 5.0 and it had regular old factory plugs, he went and put top of the line performance plugs and wires on there and i honestly couldn't tell you the difference.......but that is just my opinion.