Hole should be fine posted by Woody75 (Denver) on April 24, 2015 at 09:31 AM
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I'v only driven with the turbo for about 30.000km. (I bought the turbos at z1 for about 6-7 years ago). It doesnt appear to be a rust hole either. Metal is fine and hard around the hole. I'll take out the bolt and check when I get the time