Mine does this to. Get yourself one of these asap FALCON XR6 F6 TURBO OIL SUPPLY BRAIDED LINE KIT FILTER - eBay Turbos, Superchargers, Performance Parts, Car Parts, Accessories, Cars, Bikes, Boats. (end time 02-Aug-10 15:12:42 AEST) The standard filter for the turbo oil supply line is tiny if or when you get the kit throw it over your shoulder. Here how to get to your oil supply line filter http://www.fordxr6turbo.com/forum/index.php?showtopic=32461&st=0 When I heard this noise I freaked aswell. I ended up timing the turbo wind down for some reason. Anyway I could hear it wind down for about 25sec. After changing the oil supply line and filter with the aftermarket one I timed it again and now I can hear it wind down for almost 1min. If you can, take off the intake pipe to the turbo. There is another pipe you will have to take off aswell as it is just in the way. Presuming its a B series car all you will need is a 7mm socket (unless hose clamp has been changed then its usually an 8mm). Check the turbo impeller once it has cooled down for shaft play. Basically left to right, up and down, in and out there shouldnt be much more play than about 1mm side to side and virtually nothing in and out. Check for scrathes too. I have a very small scratch on the inside of mine but over about 8months hasnt got any worse watsoeva + im running higher boost. Im by far no expert on this stuff just spent plenty of time reading through forums. Good luck