This is a long-shot, but when I installed K&N air filters in my cars I definately noticed an increase in induction noise under acceleration.

How's the airfilter? what kind is it?

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)