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Can anyone out there tell me if the 1NZFE in our XB's are designed/manufactured in house at Toyota. Or are they outsourced? I have a debate of sorts with my father in law over this. My understanding is the design was a effort involving Yamaha and the engine is a BEAM type. I believe that has to do with the head design. Any help? This is my firt post and i'm a new member today. Thanks, Gary