It is 2 piece? I know it bolts to one of the WP studs. When I took mine out of my 2000 when I did my TB/WP it came out as one piece. But that thing was so rusty it could have been rusted together and I wouldn't have noticed.
Mine is a '96 and the tube comes apart about midway between the top of the tube and the oil pan. But, maybe it's different on later years. The top tube has an O ring around it and fits into the lower tube. The tube mating section is easily visible on mine
from above.
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