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Its a hand operated vacuum pump with a gauge on it. its used to check vacuum lines and EGR valves on cars etc. they cost about 40$.

that filter is shot. the exhaust looks good. Mine has a little more black smoke when I blip the throttle because my fuel is turned up a little. The hose connection is for the compressor intake to keep water out of it if you go into deep creek crossings. you can probably test it by hooking up a...

Turbo discharge hose split on the back side.

too much fuel or not enough air. You need a pyrometer and a boost pressure gauge.

Is the oil coming out of the slobber tube? Are you losing oil level on the dip stick, or is it rising?

A "D" turbo doesn't whistle. The turbo should spin with just a flick of your finger. It shouldn't be the cause of low power. What screen? Pic...please

is the exhaust side oily? check for shaft play too. Maybe there's nothing wrong with it. Remember, the turbo was originally added to prevent black smoke on these engines, not to produce a bunch more horsepower....maybe 5-10 more HP. They can run without one.