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Old 03-06-2015, 08:05 PM
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Roaring sound on high RPM

2011,3.5i,50K miles.
While getting on highway this afternoon I noticed car making louder than usual roaring sound coming probably from engine compartment or underneath. When driving in the city or idle I almost can't hear a difference, maybe a bit but not much. Should I be concerned and give a call to a dealer? What could cause this? I assume this is not exhaust as there is no loud sound on idle or start, could it be gasket or else?

Thanks guys in advance!
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Old 03-07-2015, 05:21 PM
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I had a chance to stop by at service today and speak with one of the reps, he came out and listened to the sound, from what he said it might be either an exhaust flap or issue with exhaust baffle. Nothing that needs immediate attention but something that needs to be looked at. The exhaust flap can be somewhat inexpensive fix where the baffle can be expensive as it will require replacing the exhaust.
I guess I will bring my car for appointment one of this days and then I'll know for sure.
Thanks for reading!
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Old 03-08-2015, 11:03 AM
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Keep us posted!

Please add the model and year in your signature?
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Old 03-08-2015, 07:18 PM
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Yes, please do post info on the vehicle for starters.

Also, if it's the exhaust flap in the rear of the muffler, you might be able to just zip tie it open and be done with it.

Allot of folks here do that to gain true dual exhaust out the back and a little sportier sound.

From what has been posted there are no adverse side affects whatsoever to keeping the exhaust valve open all the time, it seems to be like this for noise purposes but actually sounds quite sporty when it's open all the time.

Just for reference, this exhaust flap opens under full throttle or above 3K RPM's which could be why you heard something while getting up to speed.
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Old 03-08-2015, 07:51 PM
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Quote:
Originally Posted by BMWOO7 View Post
Yes, please do post info on the vehicle for starters.

Also, if it's the exhaust flap in the rear of the muffler, you might be able to just zip tie it open and be done with it.

Allot of folks here do that to gain true dual exhaust out the back and a little sportier sound.

From what has been posted there are no adverse side affects whatsoever to keeping the exhaust valve open all the time, it seems to be like this for noise purposes but actually sounds quite sporty when it's open all the time.

Just for reference, this exhaust flap opens under full throttle or above 3K RPM's which could be why you heard something while getting up to speed.
I updated my signature but for some reason it's not showing in the post. I put the car details at the beginning of my original post for reference.
Thanks for reply!
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