[JABCAT]

Originally Posted by BroDoze

Out of the past and current many cars I’ve had/have the G87 has been one of the loudest from a noise-floor perspective. I heard it on the test drives before I even owned mine.
I thought to myself that I’d enjoy the sound-deadening challenge, but it has also been one of the loudest post-sound deadening.
I really think it’s the carbon roof. I think I’m hearing a ton of resonance at various frequencies at various rpm’s. The roof is about the ONLY place I haven’t sound-deadened as I’ve been too lazy to drop the headliner.

Interesting. It's one of the quietest of any car I've owned, and the thought of adding sound deadening material never crossed my mind. It's as quiet (from a road noise perspective) as the 330e I had before it. It's a little louder with the exhaust change, but stock it was really quiet. For comparison, using the same decibel app, the M2 is on avg 20 decibels quieter than my Z06. I'll have to compare it to my wife's X3MC (which I know is louder than the M2) & see what I get.

[aerobod]

Originally Posted by BroDoze

Out of the past and current many cars I’ve had/have the G87 has been one of the loudest from a noise-floor perspective. I heard it on the test drives before I even owned mine.
I thought to myself that I’d enjoy the sound-deadening challenge, but it has also been one of the loudest post-sound deadening.
I really think it’s the carbon roof. I think I’m hearing a ton of resonance at various frequencies at various rpm’s. The roof is about the ONLY place I haven’t sound-deadened as I’ve been too lazy to drop the headliner.

You probably want to get the G42 under-bonnet noise insulation pad, too. The G87 (similar to the G80/2) doesn't come with it: https://www.leebmann24.com/de/en/pro...-hood-10296540

[mks]

Originally Posted by JABCAT

Interesting. It's one of the quietest of any car I've owned, and the thought of adding sound deadening material never crossed my mind. It's as quiet (from a road noise perspective) as the 330e I had before it. It's a little louder with the exhaust change, but stock it was really quiet. For comparison, using the same decibel app, the M2 is on avg 20 decibels quieter than my Z06. I'll have to compare it to my wife's X3MC (which I know is louder than the M2) & see what I get.

My prior Mustangs (GTs, Super Snakes, Dark Horse) were all "loud" by anyone's decibel reading. However, even with an H-pipe on my last DH, the sound quality and characteristics (not just decibels) was not uncomfortable--in fact, quite the opposite. Definitely wouldn't have considered deadening any of that part of the driving experience (in any of my Mustangs).

My experience of the M2 (now outfitted with a Dinan X-pipe) is discernably quieter (again, not just measuring mere decibels but a more holistic experience of sound quality and characteristics). It's more exotic than a Mustang but nowhere near as savage. It's rather polite...tame. With the windows up, I feel hermetically sealed off from what in a Dark Horse would be a pleasantly unavoidable roar of exhaust and general NVH.

I stopped measuring db in my Mustangs years ago--no point (and I didn't care ). But, just for curiosity, I ran a db app in the M2, windows slightly cracked, in M2-mode, at highway speed and cruising surface streets (w/in the speed limits). I registered a Min 67.1, Max 90.01, and an Ave of 82.7 (which I think is commensurate with dishwashers, vacuums, commuter trains, etc). It's just an app...and I'm not an audio expert; however, even at 90 dbs, there was nothing off-putting about the level or volume of sound.

As a retired air force guy, I can say the flight line is breaking more dbs and ear drums compared to what I've experienced in the cars I’ve owned.

In any case, for me, it's not just dbs that matter when it comes to the impact of sound. Also, for me, sound helps me feel a part of the road and more connected to the car. I've made some mistakes with exhausts that made that connection unbearable--but lessons learned.

My M2 just doesn't exhibit any discernable (bothersome) NVH, either. It's not a limo, but certainly nothing I'd want to deaden. So, even w/an x-pipe, the M2 is more than tolerable (neighborhood-safe). It's kinda (still) too quiet when considering the entire quality and characteristics of sound. But, I think the x-pipe is as far as this platform should go as far as audio aesthetics and impacts are concerned--again, for me.