Rear seat sound insulation part number

[bmwfnatic]

Interesting - the e82 looks to be quite a different shape, but it does look fairly similar in terms of material as 51488252759.

Looking at weight:

51488204055 (the original item on my car): 2.83 kg
51488252759 (the item realoem quotes): 1.67 kg
51487058127 (the e82 equivalent part): 1.16 kg

I'm kind of interested in getting 51488252759 to see what it's like.

The 759 looks like a very nice piece to be honest, good shape, but I have never seen it on a car.

[nahvkolaj]

I replaced it with mass-loaded vinyl from Second Skin. Seems to do at least as good a job as stock. The yoga mat looks like a good absorption addition.

[Obioban]

Interesting - the e82 looks to be quite a different shape, but it does look fairly similar in terms of material as 51488252759.

Looking at weight:

51488204055 (the original item on my car): 2.83 kg
51488252759 (the item realoem quotes): 1.67 kg
51487058127 (the e82 equivalent part): 1.16 kg

I'm kind of interested in getting 51488252759 to see what it's like.

Please update us, if you do!

[karter16]

I’d be curious how well the e82 part fit. BMW is using a new, very light fabric material for this purpose, that also looks like it would have better longevity.

Interesting - the e82 looks to be quite a different shape, but it does look fairly similar in terms of material as 51488252759.

Looking at weight:

51488204055 (the original item on my car): 2.83 kg
51488252759 (the item realoem quotes): 1.67 kg
51487058127 (the e82 equivalent part): 1.16 kg

I'm kind of interested in getting 51488252759 to see what it's like.

[Obioban]

I’d be curious how well the e82 part fit. BMW is using a new, very light fabric material for this purpose, that also looks like it would have better longevity.

[Casa de Mesa]

For what it's worth... go here:

https://nam3forum.com/forums/forum/main-forum/e46-2001-2006/55462-dumb-question-thread-no-flaming-allowed?p=172796#post172796

After that OEM Crayon-like smelling stuff disintegrated into nothingness, I bought a couple of yoga mats at Walmart, cut them to size and put the seats back in. It helps quite a bit with noise reduction. Much more so than that original stuff.

[heinzboehmer]

51488204055 came on my car. 51488252759 did not (or at least it wasn't there when I bought the car).

[karter16]

Hi all,

Hoping to crowd-source some knowledge here. I've pulled up the butyl-type sound deadening under the rear seat as it was all broken up as I understand happens. The part number on what I removed is 51488204055 however when I check on realoem and on schmiedmann they both indicate that that part number didn't come on my M3, and that 51488252759 (which appears to be a wool/fabric type item) is the correct part number. (or in fact did both come on the car and I'm missing the wool/fabric part).

Any advice? my understanding is that the butyl-style item is what came on our cars, but realoem doesn't list it as a superseded part or anything, just states that it's a standard 3 series E46 part, but did not come on the M3.

Keen for any thoughts/knowledge/advice. (also I know I'm probably better off to go with an after-market solution, but the purpose of this thread is to figure out what's going on between these two part numbers).

Thanks!