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A better way to phrase your question is to use the name of the engine as it is used in many Toyota and Lexus Products. The 3.5 V6is called the 2GR-FE.
Good Luck.
I think that is the VVT sensor with the filter. I have never taken out one of these and just know what I read.
Engine Variable Valve Timing (VVT) Solenoid (Left, Right) it is also named in the exploded drawing above as the intake (or exhaust) camshaft timing control valve either LH or RH. They are under the valve cover. Getting to the front ones is easy, the rear ones much more difficult. See the irate4x4 link in my post as it is the same engine.