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Exhaust. OEM?

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slappywhite
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Exhaust. OEM?

Post by slappywhite » Wed Jun 07, 2017 3:53 pm

Hi

My exhaust has started to blow a bit. It's quite loud on start up but calms down after it warms up but definitely needs replacing. Sounds like it's just one of the back boxes.

I think I want to stay OEM, it's a bit quiet but I don't fancy any drone at motorway speeds.
I'm not mad keen on going to BMW but equally not keen on somewhere like Kwik Fit.

Any suggestions?

cheers
Last edited by slappywhite on Wed Jun 07, 2017 4:02 pm, edited 1 time in total.
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Ducklakeview
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Exhaust. OEM?

Post by Ducklakeview » Wed Jun 07, 2017 4:02 pm

OEM is stainless, and only available from BMW at EYE WATERING prices. Are you sure it's not just the clamps joining the back boxes to the system? Common failure as the clamps and bolts are NOT stainless, so rust away. Replacement clamps are less than £30 in stainless on Ebay..

Mike

slappywhite
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Exhaust. OEM?

Post by slappywhite » Wed Jun 07, 2017 4:04 pm

So if it's stainless it won't have rotted? I went over a speed bump the other day and it definitely sounded like it went loose, very loud, then self corrected over the next speed bump. I can't look at it easily, it lives on the street , no access to a pit or a ramp.
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mr wilks
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Exhaust. OEM?

Post by mr wilks » Wed Jun 07, 2017 4:04 pm

Ducklakeview wrote: Wed Jun 07, 2017 4:02 pm OEM is stainless, and only available from BMW at EYE WATERING prices. Are you sure it's not just the clamps joining the back boxes to the system? Common failure as the clamps and bolts are NOT stainless, so rust away. Replacement clamps are less than £30 in stainless on Ebay..

Mike
Even more common is the corrosion of the internal "trumpet" flange where the clamp bolts the backbox to centre pipe , if that's gone the boxes are pretty much goosed :cry:
Last edited by mr wilks on Wed Jun 07, 2017 4:19 pm, edited 1 time in total.
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mr wilks
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Exhaust. OEM?

Post by mr wilks » Wed Jun 07, 2017 4:06 pm

slappywhite wrote: Wed Jun 07, 2017 4:04 pm So if it's stainless it won't have rotted? I went over a speed bump the other day and it definitely sounded like it went loose, very loud, then self corrected over the next speed bump. I can't look at it easily, it lives on the street , no access to a pit or a ramp.
If you get it looked at & its worse case scenario i have a set of OEM boxes going :thumbsup:

viewtopic.php?f=7&t=92992
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2dogs
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Exhaust. OEM?

Post by 2dogs » Wed Jun 07, 2017 4:58 pm

This happen to me the clamp just rushed away :( it's an easy fix took me 30 mins or so :)
viewtopic.php?f=3&t=90165
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AlfaScozzesi
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Exhaust. OEM?

Post by AlfaScozzesi » Wed Jun 07, 2017 6:36 pm

mr wilks wrote: Wed Jun 07, 2017 4:04 pm
Ducklakeview wrote: Wed Jun 07, 2017 4:02 pm OEM is stainless, and only available from BMW at EYE WATERING prices. Are you sure it's not just the clamps joining the back boxes to the system? Common failure as the clamps and bolts are NOT stainless, so rust away. Replacement clamps are less than £30 in stainless on Ebay..

Mike
Even more common is the corrosion of the internal "trumpet" flange where the clamp bolts the backbox to centre pipe , if that's gone the boxes are pretty much goosed :cry:
If these flanges are corroded you can just get a welder to build them up again. When I got my bypass pipes put on and the back boxes needed to be removed the clamps had to be cut off and the trumpets needed a few runs of weld and then shaping to make good.

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Post by mr wilks » Wed Jun 07, 2017 7:06 pm

AlfaScozzesi wrote: Wed Jun 07, 2017 6:36 pm
mr wilks wrote: Wed Jun 07, 2017 4:04 pm
Ducklakeview wrote: Wed Jun 07, 2017 4:02 pm OEM is stainless, and only available from BMW at EYE WATERING prices. Are you sure it's not just the clamps joining the back boxes to the system? Common failure as the clamps and bolts are NOT stainless, so rust away. Replacement clamps are less than £30 in stainless on Ebay..

Mike
Even more common is the corrosion of the internal "trumpet" flange where the clamp bolts the backbox to centre pipe , if that's gone the boxes are pretty much goosed :cry:
If these flanges are corroded you can just get a welder to build them up again. When I got my bypass pipes put on and the back boxes needed to be removed the clamps had to be cut off and the trumpets needed a few runs of weld and then shaping to make good.
I guess with the right skills anything can be refabricated , my last boxes i sold to a guy with badly corroded trumpets which even after attention continued to blow , if you have good chap on hand who won't have your pants down its always worth a try fixing first :thumbsup:
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AlfaScozzesi
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Exhaust. OEM?

Post by AlfaScozzesi » Wed Jun 07, 2017 7:12 pm

mr wilks wrote: Wed Jun 07, 2017 7:06 pm
AlfaScozzesi wrote: Wed Jun 07, 2017 6:36 pm
mr wilks wrote: Wed Jun 07, 2017 4:04 pm

Even more common is the corrosion of the internal "trumpet" flange where the clamp bolts the backbox to centre pipe , if that's gone the boxes are pretty much goosed :cry:
If these flanges are corroded you can just get a welder to build them up again. When I got my bypass pipes put on and the back boxes needed to be removed the clamps had to be cut off and the trumpets needed a few runs of weld and then shaping to make good.
I guess with the right skills anything can be refabricated , my last boxes i sold to a guy with badly corroded trumpets which even after attention continued to blow , if you have good chap on hand who won't have your pants down its always worth a try fixing first :thumbsup:
It's true that the guy who did mine makes exhausts for all kinds of cars from scratch.

His welding is unreal and all his work is with stainless.

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Exhaust. OEM?

Post by slappywhite » Thu Jun 08, 2017 8:28 am

mr wilks wrote: Wed Jun 07, 2017 4:06 pm
slappywhite wrote: Wed Jun 07, 2017 4:04 pm So if it's stainless it won't have rotted? I went over a speed bump the other day and it definitely sounded like it went loose, very loud, then self corrected over the next speed bump. I can't look at it easily, it lives on the street , no access to a pit or a ramp.
If you get it looked at & its worse case scenario i have a set of OEM boxes going :thumbsup:

viewtopic.php?f=7&t=92992
I hope I don't need them but thanks for the offer, I may have to take you up on that.
I'll get it looked at before anything falls off
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Exhaust. OEM?

Post by dgm » Thu Jun 08, 2017 8:04 pm

Be prepared for the fluted ends of the x-pipe to be potentially cracked as well. I had to replace the back boxes and x-pipe when mine went.
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Exhaust. OEM?

Post by slappywhite » Wed Jun 28, 2017 12:18 pm

OK, I had it on a ramp, finally, there's a ring just ahead of the back boxes, holds two sections of pipe together, rotted away on both sides, leaving the sections hanging apart. The garage said they could do it but when I went back they said they couldn't get the part as it was BMW only. Does this look like the right part?
http://www.ebay.co.uk/itm/BMW-Genuine-E ... 1651380278
hard to find a diagram anywhere and I still don't want to go to BMW to be told I need a whole system.
Any help much appreciated.
Thanks
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Exhaust. OEM?

Post by Ducklakeview » Wed Jun 28, 2017 12:28 pm

Are you sure it's not the clamps that have gone, with you saying "both sides?" Replacements are available on Ebay.
s-l1600.jpg
s-l1600.jpg (53.11 KiB) Viewed 1352 times
http://www.ebay.co.uk/itm/BMW-E46-M3-Z3 ... SwHxVW69F2

Which part is it on RealOEM?

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Last edited by Ducklakeview on Wed Jun 28, 2017 12:34 pm, edited 1 time in total.

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Exhaust. OEM?

Post by Fishy Dave » Wed Jun 28, 2017 12:31 pm

How about using something like this? http://www.ebay.co.uk/itm/M3-Z4M-STAINL ... 2543975872
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Ducklakeview
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Exhaust. OEM?

Post by Ducklakeview » Wed Jun 28, 2017 12:36 pm

THIS I6 kit comes with bothe the replacement clamps AND the rings.. http://www.ebay.co.uk/itm/BMW-E46-M3-Z4 ... 2286020882

Mike

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