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You only have to know how many GT-Rs worldwide have been tuned via Cobb AccessPorts to realise how reliable and safe they are.
Unless the tuner has been chasing silly numbers and been too ambitious with the tune, it should not compromise reliability at all.
In fact I would not be surprised to see standard tune cars begin to suffer bore wash long term because they run so rich. A condition that any Cobb tune would correct.
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