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BMW M2 Forums 2023+ (G87) Engine, Exhaust, Drivetrain, Tuning Modifications

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      09-24-2024, 07:43 PM   #67
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Originally Posted by MASHCT View Post
I was probably about 3' away from the exhaust & directly in the middle of the pipes. Any closer I thought would be too close to the bumper & not really picking up the full sound coming freely from the pipes. Should I check again with the phone in a different spot?
No I think 3 feet is perfect. The only Db I found online https://www.google.com/search?q=g87+...t=gws-wiz-serp
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      09-29-2024, 11:10 AM   #68
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So here is a shot of my bud's stock exhaust outside. The set up I have is 13db louder. This was his loudest of all his revs. Same app used for both level tests.

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Last edited by MASHCT; 09-29-2024 at 11:17 AM..
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      09-29-2024, 10:29 PM   #69
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Using the Decibel X app, in the cabin with everything set to sport & the flaps open to the oem limit, ACC at 85 mph on the interstate the app was showing between 70-72 decibels.

Compared to the same settings, same speed, same interstate on Thurs with the flaps closed it was showing 75-80 decibels. This was before I moved the heat shield that appeared too close to the driver's side pipe.

For comparison my supercharged Z06 with Corsa Xtreme exhaust & 80 mil sound deadening material in the entire cabin, shows 85-90 decibels under the same speed/road conditions.
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      09-30-2024, 12:55 PM   #70
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Quote:
Originally Posted by MASHCT View Post
So here is a shot of my bud's stock exhaust outside. The set up I have is 13db louder. This was his loudest of all his revs. Same app used for both level tests.

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Excellent data! I thought 112 db for a stock car was to high.
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      09-30-2024, 12:58 PM   #71
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Quote:
Originally Posted by JABCAT View Post
Using the Decibel X app, in the cabin with everything set to sport & the flaps open to the oem limit, ACC at 85 mph on the interstate the app was showing between 70-72 decibels.

Compared to the same settings, same speed, same interstate on Thurs with the flaps closed it was showing 75-80 decibels. This was before I moved the heat shield that appeared too close to the driver's side pipe.

For comparison my supercharged Z06 with Corsa Xtreme exhaust & 80 mil sound deadening material in the entire cabin, shows 85-90 decibels under the same speed/road conditions.
Please do it again now that it's been fixed. My previous car f80 also had a higher DB reading on highway with the valve closed vs open.

Open valves on the highway gave a less drony sound vs the open and it was the complete opposite around town. In some instances open is better when cruising at highway speeds.
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