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Typical of cracks on stock turbos...
You might lose a little of efficiency from the cracks, but I bet the butt dyno can't feel a thing.
More importantly, if cracks extend into mating areas of (metal) gasket, it can kill the gaskets prematurely.
The one big crack by the stud on the turbo exhaust manifold will surely kill the metal gasket in a very short time.
Good news is that those S4 turbo parts are a dime a dozen.
Check classfieds, eBay, etc. for good, used replacement parts.
-Ted
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