Here is what happens if you leave those hairline cracks get worse.
That was the worst one that i pulled out of my car. The others had small hairline cracks so better replace them all. Just so you know the car will run but it is guaranteed that it wont be at its full potential. Also it is definitely cased by snow and salt, so people in warmer weather wont have to deal with this as often, but cold weather and rain can also be a factor. Another note is that the driver side coils were worse then the passenger and the ones that were more exposed to the floor and wheel are the ones that have it worse.
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