I contend that there is something about ULSD that my car just does not like. No leaks at IP, had some leaking fuel hose and returns but changed 'em all out. Swapped two injectors out. Replaced tank screen. Fuel fiters, yada yada. I did it all. Car just doesn't go like butta as before. I mean the car was fast. Now it ain't. This change occurred about a tank after ULSD hit the scene. I can hear an airy kind of tapping noise in time with RPM. I used to have another car that made the same-ish sound due to an exhaust manifold that had a hole in it. ? Maybe its coincidence and I need a new turbo mount kit. Boost press is down about a pound or so. Oh well- I need new turbo seals anyway. I think I'll rebuild that spare turbo I have lying around and go to town.

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'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)