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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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1995 - SVX 700,000 K Mine, DMS Struts to lift car 2in. Tyres Wrangler Silent Armor 235/70R16, PBR Radiator. 6 speed with DCCD and R180 rer diff, Heavy duty top strut mounts front and rear. Speedo correction box fitted. New stero (gave up on the old one). Back seat removed and 2 spare tyres fitted for desert driving. ECUTune SC sitting in the box for the next SVX.
1992 - SVX 255 K Wife (Want to stay Married so not allowed to fit SC)
1992 - SVX Pearl with black roof race car roll cauge etc ready to race. Ex Tasman Targa car.
1995 - SVX Green low k mint condiation.
1995 - SVX Rally car, ex Matts car. Now to be used on track.
1992 - SVX red & Black being converted to Mid Engine.
1995 - SVX Red 143,000 bit rough.
Owned 5 others Subaru back to a 1974 1400 GSR.
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