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Originally Posted by lemans4.8
yeah, i noticed the same in my '05 4.8.... It's hard to describe the sound but the growl's pitch goes "up-and-down" repeatedly, kind of like an older diesel engine at idle (but a little slower)
Are you running an aftermarket intake or air filter? I'm running a Greenfilter in the stock intake box and I just figured it was the excess air going into the engine....
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Yes, about one month ago, I renewed air filter element with OE BMW part and the roaring sound came after the replacement. One week ago, I also renew the MAF sensor with OE BMW part, the sound still existed.