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Again look for the decal on the inside of your boot lid.
It should have the vacuum line layout.
Also look again at the link I sent.
Look at H,I,J,K,and L
One branch of your "Y" is going to go to your transmission.
The other branch is going to go to the flapper change over valve or directly to the flapper valve.
Just about every year Boxster is a little different in how the vacuum lines are laid out.
Lay out also depends on Transmission type and Country it was shipped to.
The decal on the inside of the boot lid should tell you how yours is laid out.
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