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Installed the catback flowmaster 40 series. Nice sound and I am overall happy with it. But I do get droning at 86 MPH or lower in 6th gear. If I downshift (via manual mode) then it goes away. I am planning to delete my active fuel management with my Superchips tuner tomorrow as I have heard that this will fix the problem. I will let you know. BTW...if you have not figured it out, I drive an A6.
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