Quote:
Originally Posted by Boss330
Is this whistling noise on the MB CLA there just to disguise engine RPM's?
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I strongly suspect it is just pressurized air, air/fuel or even exhaust leaking in the turbo system somewhere due to a poorly fitting part or an improperly torqued bolt(s). This is a known issue. As noted above this would not disguise the fundamental combustion frequency in a fourier transform.