Sorry, maybe I should have been clearer. At the kind of boost we (most of us on a budget) are running (less than 30psi), can not having a dump valve actually damage the turbo? That article seem to suggest that fitting a dump valve is a common mistake and they actually cause more harm (by reducing performance) than good. It doesn't mention anything about damage. Are they just used to people who can afford a rebuild every five minutes or is the risk of damage so minimal they it wasn't worth mentioning?
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