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My aftermarket exhaust is too loud!

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635sharknose
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My aftermarket exhaust is too loud!

Post by 635sharknose » Mon Mar 30, 2020 5:43 pm

The noise coming from my exhaust is too loud and I would like to muffle this.

I have a stainless steel middle silencer and end silencer, I think from Ireland Engineering.
And an aftermarket catalyst, brand unknown perhaps Magnaflow??

I have the impression that the middle silencer is hollow, when I tap it I hear no damping at all, the exhaust seems to have some damping when I tap it.

Does anyone have a good idea how to muffle it? I was thinking of cutting out the middle silencer and replace it with another one, but which one?
I don't want to completely replace the existing system with an original BMW system, that costs way too much.

It's a BMW 635CSI, 1987 with catalytic converter (USA model).
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1987 635CSi Bronzitbeige

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635sharknose
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Re: My aftermarket exhaust is too loud!

Post by 635sharknose » Tue Mar 31, 2020 3:59 pm

Took the Ireland exhaust out.
The middle silencer sounds hollow on all spots where I tap it. The pipes are straight through. I don't think it will muffle much.
Thinking of cutting out this silencer and weld in a replacement silencer of a more quiet type. Saw some nice models of the brand Flowmaster, which will do the trick I assume.
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GRNSHRK
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Re: My aftermarket exhaust is too loud!

Post by GRNSHRK » Thu Apr 02, 2020 6:49 pm

Looking at your second photo, it appears that you also have headers :-k

And the collectors have been joined into one larger pipe, then into the cat, followed by a resonator that doesn't appear to be doing anything according to you, then finally the muffler [-(

If you are sure that the exhaust is from Ireland Engineering, why not contact them for advice [-o<

I have a "similar" setup, thanks to the previous owner having installed Stahl long tube headers, which have been a royal PITA to deal with, but I still have them on :roll:

Here's a shot from front to back, wherein you can see that the headers end beyond the tranny :shock:

After the cat, I have a short resonator, I'd have to find the receipt for the name of the manufacturer, but I'm fairly certain it wasn't even for a 6er [-X

Anyhoo, think I'd start with Ireland before doing anything else =D>
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:mrgreen:
Bobbo
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Re: My aftermarket exhaust is too loud!

Post by bpoliakoff » Thu Apr 02, 2020 7:43 pm

Bobbo may be able to chime in here but I am not sure if I saw it here or on another forum. It was a type of resonator that absorbed or deadened sound and controlled exhaust noise.Maybe by googling around looking for exhaust sound absorber or some such it might pop up up. They very large and could easily be fitted into your system. i have a Billy Boat system which may prove to be too noisy and I will end up looking for these They appear to be a legitimate solution
81 Euro 635 M90 with motronic. Currently under a complete nut and bolt restoration. Pictures at
flickr.com/photos/bertsphotos.

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635sharknose
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Re: My aftermarket exhaust is too loud!

Post by 635sharknose » Fri Apr 03, 2020 6:47 pm

Hey guys, thanks for your replies.
Good idea, I have emailed Ireland right away, will have to wait for their reply.
Do I see it correctly that you have an ellips shaped end muffler? I would assume they will not fit.

I searched the internet for this absorber, but I am not able to find it. Or more precise I am not quite sure what I am looking for so perhaps I did not recognize it. Doesn't it look like a muffler?
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Re: My aftermarket exhaust is too loud!

Post by GRNSHRK » Fri Apr 03, 2020 7:36 pm

The rear muffler is actually kind of "square" cross section, more tall than wide I think, in fact it's also what's left of my Billy Boat (B & B TriFlo) system that I tried years ago :-?

Bert and myself have been round and round about these systems, they are still using glass packs for a resonator, talk about loud :shock:

And the drone, they had to go [-X

Bert can probably confirm the shape of the rear muffler, I can always take photo as well, if you need [-o<

Lemme know \:D/
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Re: My aftermarket exhaust is too loud!

Post by 635sharknose » Sat Apr 04, 2020 8:02 am

Oh, OK, now I see.
It is this muffler right? https://www.lmperformance.com/images/pa ... -0720e.jpg
So these are quite loud as well. Are there any aftermarket exhausts on the market which aren't?
I see some Italian brands making more stock look-a-like mufflers (ASSO, ANSA) and also the mufflers of Walker. Anybody has experience with these?
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Re: My aftermarket exhaust is too loud!

Post by bpoliakoff » Sat Apr 04, 2020 4:40 pm

That is the muffler we are talking about.
81 Euro 635 M90 with motronic. Currently under a complete nut and bolt restoration. Pictures at
flickr.com/photos/bertsphotos.

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635sharknose
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Re: My aftermarket exhaust is too loud!

Post by 635sharknose » Thu Apr 16, 2020 2:30 pm

Contacted Ireland, they confirmed it is their exhaust. They mentioned that this is just how it sounds and that they cannot help me reducing the noice.
Well, I am quite sure some younger folks love the sound coming from it :D, but for me as a 40-er it is too loud. :wink:

I bought a middle silencer of a 5 series, type E34.
In terms of dimensions and tubes, this is the same as the middle silencer of Ireland (it took me a few hours of research to find it! :lol: ).
This has considerably more damping than the silencer that is now on the car. According to the manufacturer of the E34 exhaust, is sounds simular to an original middle silencer.

Just cut and weld it and run a test!

I hope this reduces the noise. My 6-er does not have to be quiet, but a few DB's less would be great.

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635sharknose
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Re: My aftermarket exhaust is too loud!

Post by 635sharknose » Fri Jun 12, 2020 5:33 pm

Guys, just wanted to let you know that welding in this E34 silencer worked out pretty good.
The noise is reduced by some dB's making it much better.
It still isn't a quite car, but now it is just fine, not so loud anymore. :D
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1987 635CSi Bronzitbeige

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