One hose goes to the intake manifold and the other to the throttle body.
The one that goes to the intake manifold is a PITA to get in, the one under the throttle body is a litte easier to connect.
I use electrical tape to seal them. The one under the intake manifold is tightly attached with a tie wrap. It took me a while to get it in there, what a pain!!!

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1999 Porsche 996 Carrera Convertible
1994 420E - SOLD
1986 300E - SOLD, what a car
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