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'98 S70 T5-M - Exhaust Burble at high RPM S70 1998

The other day I noticed what I believe to be a new noise. If the engine is revved real high (works at idle, easiest to detect, get someone outside by exhaust and someone to rev) like 4000 RPMs as you back off the throttle you can hear a real deep burble (every time) reminiscent of an American V8, while this sounds cool I don't expect it from my turbocharged white engine.

Anyways, anyone know what causes this? does it indicate a problem? is it normal and I just never noticed it before?

It's somewhat disconcerting since I don't ever remember hearing it before.


Thanks,
Scott Silverman
--
'98 S70 T5-M - Tropic Green w/ tan, Spoiler, Fog Lights, CD-6/CD-3 Changer, External Amp, Cold Weather Pkg, Sunroof






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