Originally Posted by equipment junkie
If you look at the picture shown a couple of posts above (from the cobb ap info) - you'll see where the pill is supposed to be. If for dome reason there is no pill inside the particular vacume line as indicated in the photo - you should be able to purchase one from your loca Subaru dealership.
Drill it out as described, place it into the vacume line - lube it with silicone spray (or even some light oil) - push it into the vacume line 1/2 " to 3/4". Obviously, you want to make sure that the
drilled hole in the brass pill is aligned with the vacume tube to allow air to pass throught it (I know it sounds pretty obvious - but I've seen simpler things screwed up!)
While I worked at Trollhattan Motors (a SAAB & Volvo place) a few years back, we had learned from the Bosch School in California that silicone spray should not be used anywhere it could be sucked into the engine. In small amounts it is supposed to casue the Lambda to prematurly fail or give bad readings and in large amounts will casue it to go haywire almost right away.
Are there and chemists out there who can confirm? Regular O2 sensors are expensive enough, I'd hate for some one to prematurly ruin a wideband.