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MillerMan had the same problem on his 9-5. Just a few drops of coolant after parking the car, same spot as Wulf describes.
It was solved by retightening the coolanthose jubilee clips.

A 9-3SS/SC TD04 turbo won't fit. Compressorhousing and turbinehousing are completely different. Look further for a TD04 from a 9-5 Aero or 9-3 Viggen.