For turbo/intercooler, yes I would go silicone. I changed mine to silicone. I doubt you will notice any difference in performance, but they are less likely to cause problems in the future as well.
Do you mean silicone for cooling systems hoses as well? If so, I don't see the point really. I guess they might be less likely to fail than rubber, but I would be happy sticking to rubber hoses for cooling system. Depends if you want to replace them all or just heater hoses. A set of heater hoses only is not very expensive.


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