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Fiberglass is not bad, in my opinion is better because you can always fix it.
I know some people say, poly is the way to go because doesn't crack easilly.. That's so wrong!!
We have customers that they have splitters in poly and they crack very easy.
do not blame the product or manufacturer, all depends how you install it, the way you drive, the location and how bad is the road.
We have customers with Fiberglass/carbon fiber splitters and all of them are fine.