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If everything is healthy the increase in system pressure won't matter. If something is marginal or already failing it may cause it to fail. Personally as long as I had new hoses upper, lower, and heater core (i think those are all the coolant hoses on the car) I'd have no qualms as long as I thought the engine was healthy. If the engine is suspect due a pressure test of the system at 30 PSI and check a steady pressure over a few hours. If you don't hold pressure then you might have an issue that the 1.3bar cap might make worse.
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