| I've been running inline oil filters on my setup now for 50K miles and at this point would never consider putting turbos on my car without them. 
One thing that I dont think many people consider is the debris that comes out of an engine block when it is started for the first time. After all the machine work has been done, even despite your best efforts to remove all the small particles from the oil galleys, there is still a ton of garbage that will find its way into the turbo oil feeds. When I first started my Z with the fresh engine I let it reach operating temp and then drained the oil and removed the inline filters. I backwashed the filters with brake parts cleaner into a bowl and was amazed at how much garbage would have gone through the turbos without them, and significantly shortened their service life. I cannot speak to any inline filter brand to use other than those which I used in my build. Here is where I got mine from:
[ http://www.mcmaster.com/#hydraulic-oil-filters/=be2r5f ] They are #9800K52, $21.02 each. I pulled them apart just a couple of weeks ago when I had the motor out for the R&R and internally they look just as good as the day I installed them. I washed the sintered bronze element (10 micron) and put them back together. All I did with the feed lines is I bored out the AN fitting on the IN side for the filter and inserted a 0.035" welding tip to limit flow. I have had two opportunities to inspect the turbos over that 50K mile use and have seen nothing but good results. FWIW, I've only taken these filters apart three times in that 50K I've used them. Once after initial startup, once around 30K miles and then again just a few weeks ago at 49,xxx miles. The filters aren't really there to provide ongoing filtering - the main oil filter takes care of that after any debris has come loose in the motor, but I still wouldn't remove them. I suspect that a large part of premature turbo failure is caused not by manufacturing issues, but rather by contaminants passing through the sensitive bearing assembly. Just my $.02.
Enthusiasts soon understand each other. --W. Irving.
Are you an enthusiast? If you are out to describe the truth, leave elegance to the
tailor.
Albert Einstein
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