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Old 03-07-2013, 06:44 PM   #1
Zachbiz
Scooby Newbie
 
Member#: 331281
Join Date: Sep 2012
Chapter/Region: SCIC
Location: San Diego, CA/Prescott, AZ
Vehicle:
2002 wrx
WRB

Default Really Weird oscillating humming noise. 5th gear

I get the very strange oscillating humming noise that is the exact same tone as the exhaust. I can't capture it on video. I can only describe it as the typical highway exhaust drone but in a "WUB WUB WUB WUB" patter.

I have an HKS catback with a tomioka racing catless downpipe and an unknown catless up. I noticed this about 4 months ago, thought i was going crazy but then it comes back and its very noticeable. No associated vibrations that i can feel. It does not seem to change very much with speed, just gets louder the wider i open the throttle.

could this just be the exhaust hitting a resonant frequency or could this be the sign of a slowly dying part. It seems way to deep of a note to be a wheel bearing.

any help would be great thanks.
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