sounds like a nice bit of turbocharger wastegate overrun to me. But I'll let the others chip in! Good to see you're letting the beast off the leash!
<EDIT> interestingly I then went and looked it up on wikipedia and found this
Wastegate - Wikipedia, the free encyclopedia
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StumpyPete
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Last edited by StumpyPete; 03-26-2010 at 04:50 PM.
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