Flex fan

I've ran a flex is several cars and no issues. Stay away from plastic and fiberglass ones and you'll be OK. Buy a good name band like Flex-a-Light, Hayden, etc. One of the Summit Racing fans I got was made in the USA by Hayden. If you worried do a yearly check for fatigue, if worried replace it.

On my GTS the issues for me was the thick core of the Cold Case Radiator and power steering meant no Clutch fan for me and I have to get a low profile flex or it would fit the PS pump pulley nut.