this debate was had some time ago but i cant remember the company that tested it.
they took 2 cars, same setup, one with dv, one without.
and over a set period of time tested the turbos for wear etc.
both wore equally.
as martin says, was around 18-20psi plus that it became an issue due to the higher pressure.
but then this would then depend on the unit you are using as most uprated units can take more abuse than a factory standard unit anyway.
my old red one used to chatter well.
all i did was fit a k+n filter and upped the boost a bit.
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