[Tcoat]

Originally Posted by Arcadien Angel

Thanks for the replay, that does make some sense, but the FRS does not have a CVT. The gear ratios are a little different, but being in 6th gear in the auto and 6th gear in the manual should pull almost the same vacuum. Even in 6th gear, an angine with an AT will pull heavy vacuum during engine braking, same as an MT.

To further the point, and Edelbrock Supercharger on these cars is the same for AT and MT, and it needs vacuum for the bypass valve. If the vacuum was different on MT and AT, then the Bypass vacle should act differently or incorrectly if you have an AT, which it does not.

Not really sure why you are so concerned with this. Send an email to the Subaru engineers and ask them why. They obviously have a reason but everybody making up guesses is just pissing into the wind.