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Originally Posted by Dessertrunner
Can't hear the sound but my guess is that both cars have a "Induction control value" on the intake manifold. This change the air flow path and ther by changes the sound. I would also suggest that you look at the underside of the manifold at the front between the power steering and the alternator as there is a small vacum hose that comes off a plastic box. This hose generally breaks away from a plastice value. What you might be hearing is the vacum leak or the IC value partially opening due to the leak. THis only operates around 3,000 rpm.
Tony
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References from EJ22:
(Pages 14 and 17)
http://surrealmirage.com/subaru/files/SAE_boxer.pdf
http://www.lovehorsepower.com/images...ter/finish.jpg
http://surrealmirage.com/subaru/imag...ndcoilpack.jpg
http://www.swaqvalley.com/images/199...k/IMG_0840.jpg
I don't think the EJ22 has the same intake design as the EG33 does but I could always be wrong...