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      03-18-2020, 11:53 PM   #309
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Quote:
Originally Posted by flybigjet View Post
Ah-- those are on my list to order tomorrow.
I'm still waiting to order:

51487334357 (Sound insulating wheel housing rear left)
51487334358 (Sound insulating wheel housing rear right)
51487296055 (Sound insulation trunk left)
51487296056 (Sound insulation trunk right)
51471911992 (Expaning rivet (D=8MM))

I've been putting it off because it's about $200 of special order parts. I'll probably do it at some point, but thought the parts I've done already should make the biggest difference.
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      03-19-2020, 10:58 PM   #310
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So I got to drive my car today and you know what I heard for the first time? Wind noise!

Initially I was disappointed with the improvement that the side panels made, because the benefits are really at high speed. I'm very happy so far, and as soon as I can afford it, I'm adding the remaining parts (hood insulation and rear arch parts).

I don't think we're ever going to get rid of road noise, and some surfaces are obviously louder than others, but I'm still really happy with the improvements over stock.

Thanks to all who pioneered this for the rest of us!
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      03-20-2020, 12:24 AM   #311
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Quote:
Originally Posted by Nezil View Post
So I got to drive my car today and you know what I heard for the first time? Wind noise!
%snip%
Very nice!

I have been too busy to add insulation to the trunk, but it will happen. In the interim, I am trying to understand if the parts I have added so far have led to an increase in air pressure. It's crazy annoying. It may be that what I am feeling (hearing?) was always present. Anyway, it is conspicuous. I have been reading some on the subject to understand if there are things I might do.

Road trip science: Why the car's open rear window hurts your ears
...
Quote:
First, although humans can’t truly hear that rear window noise, it certainly is powerful: it hits peaks of pressure of 100 pascals, equivalent to 130 decibels. There’s a good reason why our ears can’t stand it for long.
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      03-20-2020, 01:25 PM   #312
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Originally Posted by Zeese View Post
In the interim, I am trying to understand if the parts I have added so far have led to an increase in air pressure. It's crazy annoying. It may be that what I am feeling (hearing?) was always present. Anyway, it is conspicuous.
...
I'm sympathetic Zeese, but I don't see how that could be possible. The side panels only block off an area that does not have any openings to the outside. The fender gap foam does block off air flow I think. If you look from the engine bay after removing the plastic covers on either side of the bulkhead where the 12v power and brake fluid reservoir are you can see the other side of the foam right there, which is presumably why it cuts noise from under the hood. Even so, I can't see how that would build pressure inside the cabin.

What might be worth investigating is if the vents in the rear of the car are functioning correctly. These vent to somewhere in the rear wheel arch I believe, and some people have blocked these up to protect the amplifier from getting wet. Blocking these up would certainly cause a problem because any air coming in from the A/C system would have no-where to go.
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      03-31-2020, 04:35 PM   #313
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Add me to the list of people who installed the door seals. They definitely made a noticeable difference. Even the stereo sounds better when you code out ASD. For 30 bucks it's a great mod. Thanks!
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      04-03-2020, 09:22 AM   #314
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maybe it's because I come from a diesel truck and 4x4 background but m2 is pretty quiet with ASD gone, even with a fabspeed muffler bypass. I like how "raw" the car is for a 2018.

I will however take a look at these door seals and if I ever get the clean sub set-up other forum members are running i will dynamat the trunk and doors. It doesn't add that much weight to do this.

I'm about to start ordering all the bits to Sound deaden my big diesel cummins, maybe i'm just use to 5" exhaust, rattling 6cyl diesels and 37" aggressive tires. But the M2 is great to drive, stock stereo sucks for sure and I daily mine
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      06-06-2020, 06:04 PM   #315
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I have finally had the sound insulation pieces for the rear of the car installed by a friend who is a BMW tech as I was too afraid to break any of the trim clips.
Must say I'm very pleased with the reduced road noise.
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      06-08-2020, 03:33 PM   #316
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Quote:
Originally Posted by voyagergab View Post
I have finally had the sound insulation pieces for the rear of the car installed by a friend who is a BMW tech as I was too afraid to break any of the trim clips.
Must say I'm very pleased with the reduced road noise.
I did mine a couple of weeks back and was surprised at the difference in road noise. I actually wasn't expecting much because I'd done everything else except for the under hood insulation, but I was pleasantly surprised.

With my soft close doors, it's starting to feel all kinds of luxury now Haha.
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      06-08-2020, 03:39 PM   #317
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Quote:
Originally Posted by Nezil View Post
I did mine a couple of weeks back and was surprised at the difference in road noise. I actually wasn't expecting much because I'd done everything else except for the under hood insulation, but I was pleasantly surprised.

With my soft close doors, it's starting to feel all kinds of luxury now Haha.
You did soft close doors?! Nice!!
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      06-08-2020, 03:53 PM   #318
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Quote:
Originally Posted by Nezil View Post
Quote:
Originally Posted by voyagergab View Post
I have finally had the sound insulation pieces for the rear of the car installed by a friend who is a BMW tech as I was too afraid to break any of the trim clips.
Must say I'm very pleased with the reduced road noise.
I did mine a couple of weeks back and was surprised at the difference in road noise. I actually wasn't expecting much because I'd done everything else except for the under hood insulation, but I was pleasantly surprised.

With my soft close doors, it's starting to feel all kinds of luxury now Haha.
Nice, I been going through your threads because I had to hardwire my dash cam and it was extremely helpful!

You're pretty good at DYIs, keep it up
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      06-08-2020, 05:01 PM   #319
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Quote:
Originally Posted by bee500 View Post
Add me to the list of people who installed the door seals. They definitely made a noticeable difference. Even the stereo sounds better when you code out ASD. For 30 bucks it's a great mod. Thanks!
Did this as well and the seals definitely made a difference.

You know what *Really* helps with road noise????

New tires - door seals are shrinking in awe right now.
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      06-15-2020, 12:27 PM   #320
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Just ordered all this stuff and will document changes with Radioshack SPL meter in a few weeks.

Installing better speakers too so it should all be complimentary.

Ok NVM the online parts places won't ship to Canada right now and local dealer wants 2x online prices so I'll wait until the border opens.

Last edited by n8dgr84; 06-15-2020 at 03:23 PM..
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      06-15-2020, 10:44 PM   #321
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Got the pieces for the rear. Made a considerable difference any time there is lots of tire/road noise, like driving on the freeway or rougher roads. It was a bit of a pain to install properly under all the OEM wiring, but not too bad and well worth the effort. It took me a couple of hours, but I know my way around this stuff.
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      06-17-2020, 02:55 AM   #322
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I did 675 miles in about 10 hours today with just two quick gas-n-go's.

For the Love of God did I screw up by not making time to take the back apart and install the two aluminum panels and the wheelwell and trunk soundproofing.

This thing gets LOUD after ten hours.

Yikes.

Lesson learned. I'll be back home in July, which means I'll get to it in August. IF I can find a DIY.

Now, hopefully the ringing in my ears calms down.
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      06-19-2020, 08:23 AM   #323
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I’m having a hard time visualizing where those aluminum pieces go.
Anyone have pics of them installed?
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      06-19-2020, 08:34 AM   #324
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Quote:
Originally Posted by flybigjet View Post
I did 675 miles in about 10 hours today with just two quick gas-n-go's.

For the Love of God did I screw up by not making time to take the back apart and install the two aluminum panels and the wheelwell and trunk soundproofing.

This thing gets LOUD after ten hours.

Yikes.

Lesson learned. I'll be back home in July, which means I'll get to it in August. IF I can find a DIY.

Now, hopefully the ringing in my ears calms down.
New tires make a *Huge* difference - I just had General Tires installed - ConsumerReports rate them comparable to Michelins and about half price.

Got them from Rudy at Tirerack.com. If your tires have significant wear on them - get the Generals (or new tires period) - trust me - you will have a *much* quieter car.

The insulation in the front doors as others have mentioned work as well - I did those - it helped but my God - the tires.
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      06-19-2020, 08:59 AM   #325
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Originally Posted by nearwater4me View Post
I’m having a hard time visualizing where those aluminum pieces go.
Anyone have pics of them installed?
https://www.bimmerpost.com/forums/sh...php?p=26278037

far right in last picture
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      06-22-2020, 12:37 AM   #326
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Ah, I see. So it covers that hole?
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      06-22-2020, 01:07 AM   #327
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Originally Posted by nearwater4me View Post
Ah, I see. So it covers that hole?
It covers that hole.

- Left aluminum rear side cover & clips (41007294289, 51489119216 x6)
- Right aluminum rear side cover & clips (41007294290, 51489119216 x6)
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      06-22-2020, 03:19 AM   #328
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Quote:
Originally Posted by Zeese View Post
Very nice!

...In the interim, I am trying to understand if the parts I have added so far have led to an increase in air pressure. It's crazy annoying. It may be that what I am feeling (hearing?) was always present. Anyway, it is conspicuous.....

...
I had this type of sensation when I installed the Active Autowerke exhaust on my N55. Had extremely poor fitment from the downpipe adapter and midpipe. On highway trips it felt like pressure would build up in my ears. Everything was fixed after I had the pipes modded to not touch anything.
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      06-23-2020, 12:25 AM   #329
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Quote:
Originally Posted by CoffeeLife View Post
I had this type of sensation when I installed the Active Autowerke exhaust on my N55. Had extremely poor fitment from the downpipe adapter and midpipe. On highway trips it felt like pressure would build up in my ears. Everything was fixed after I had the pipes modded to not touch anything.
Intriguing. Thanks!

Mostly in triage mode for several months. Hoping to return to the most important task at hand in two weeks: Sound deadening! The trunk insulation should get installed before too long. After that? I want to put the OEM resonator back in. Or, more correctly, correct for the resonator delete. That being said, perhaps a trip to my exhaust shop for an inspection makes a lot of sense! Certainly curious. Brilliant tip!
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      07-02-2020, 09:16 AM   #330
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Can someone with an M2C (ideally an EU car) confirm which part to install?

And if there were some changes betwen M2A/B/C

Many thanks in advance!
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