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      08-22-2013, 01:10 PM   #45
AlphaAlpineM6
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Quote:
Originally Posted by AMS ALPHA View Post
Alpine to be clear what you stated earlier is not the issue. The issue we are seeing is with the donut gasket but not as you have it shown. The picture you have shown has your gasket installed incorrectly. Your tech installed the gasket on the pipe before installing the pipe in the car. This caused that metal isolator gasket to float around and rattle. The donut gasket should go on after the install on the back side of the pipe just like from the factory so as to secure it in the downpipe carrier brace. We install the donut gasket the same as the factory. This is why we did not have an instruction sheet for this pieces as it installs the same as the stock downpipe does. Regardless we will get some instructions made up here in the very near future.

What we are seeing on this car is that even with the donut gasket installed correctly there is a rattle. This is stemming from the fact that on some cars as they are assembled from the factory the donut gasket is crushed in a way that when you attempt to reinstall it the donut no longer sits flush against that metal vibration isolator gasket. This also causes that metal gasket to then rattle around.

So the same item is causing the noise in both cars but the reasons are a little different. Yours stems from an improper install while Hunter's stems from a bad donut gasket. We have new gaskets on order that we are installing in Hunter's car that we feel should fix the issue. If it does we are going to include new donut gaskets with the purchase of every downpipe set.

Sorry for the long post, I just wanted everyone to be clear on what we have found so far.

Eric
Just to be clear, my car does NOT rattle..
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      08-22-2013, 01:56 PM   #46
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Quote:
Originally Posted by AMS ALPHA View Post
Alpine to be clear what you stated earlier is not the issue. The issue we are seeing is with the donut gasket but not as you have it shown. The picture you have shown has your gasket installed incorrectly. Your tech installed the gasket on the pipe before installing the pipe in the car. This caused that metal isolator gasket to float around and rattle. The donut gasket should go on after the install on the back side of the pipe just like from the factory so as to secure it in the downpipe carrier brace. We install the donut gasket the same as the factory. This is why we did not have an instruction sheet for this pieces as it installs the same as the stock downpipe does. Regardless we will get some instructions made up here in the very near future.

What we are seeing on this car is that even with the donut gasket installed correctly there is a rattle. This is stemming from the fact that on some cars as they are assembled from the factory the donut gasket is crushed in a way that when you attempt to reinstall it the donut no longer sits flush against that metal vibration isolator gasket. This also causes that metal gasket to then rattle around.

So the same item is causing the noise in both cars but the reasons are a little different. Yours stems from an improper install while Hunter's stems from a bad donut gasket. We have new gaskets on order that we are installing in Hunter's car that we feel should fix the issue. If it does we are going to include new donut gaskets with the purchase of every downpipe set.

Sorry for the long post, I just wanted everyone to be clear on what we have found so far.

Eric
Can you post the part # for the gaskets?
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      08-22-2013, 02:39 PM   #47
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Quote:
Originally Posted by greentrbo95gst View Post
Can you post the part # for the gaskets?
You can find it here:

http://www.realoem.com/bmw/showparts...52&hg=18&fg=10
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      08-22-2013, 03:12 PM   #48
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Thanks.
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      08-22-2013, 03:21 PM   #49
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Are we talking about 6 or 7?
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      08-22-2013, 03:36 PM   #50
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Quote:
Originally Posted by AlphaAlpineM6 View Post
Just to be clear, my car does NOT rattle..
My apologies, I read your post as if you had the rattle then found the cause with the placement of your donunt gasket being in the wrong spot.

Quote:
Originally Posted by greentrbo95gst View Post
Are we talking about 6 or 7?
On that drawing number 7 is the gasket you need to replace and the rattle is caused by number 6 flopping around.

Eric
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      08-22-2013, 04:03 PM   #51
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Quote:
Originally Posted by AMS ALPHA View Post
My apologies, I read your post as if you had the rattle then found the cause with the placement of your donunt gasket being in the wrong spot.



On that drawing number 7 is the gasket you need to replace and the rattle is caused by number 6 flopping around.

Eric
Did I just talk to you? I just called you guys.
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      08-23-2013, 12:18 PM   #52
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Quote:
Originally Posted by greentrbo95gst View Post
Did I just talk to you? I just called you guys.
I don't believe so.

Good news, using a new gasket fixed Hunters noise. Problem solved and all new sales will have this gasket set included in the package.

Sorry for the issue but thankfully it was a very simple fix.

Eric
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      08-23-2013, 12:31 PM   #53
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BOOM! Thank you AMS.... Case Closed!
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      08-23-2013, 08:21 PM   #54
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Sweet news!
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      08-24-2013, 08:20 PM   #55
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Hey guys, for those running catted downpipes Forum member Noushy and I have a better option for the O2 sensors. The stock ones are to short for the AMS downpipes. They will work but they will not clip in their factory clip locations which are the ideal places to run the wires because it's OE placement. Below I have a pic of 2 options. I went with the one on the left because it has insulation. The lines are long enough(approximately 6inches or so longer than our stock ones) to fit into the stock clipping locations so everything fits perfect. However the connectors aren't the same as the connectors on the sensors that come with our car so all you have to do is get a pin removal tool so you can easily remove and swap the connectors with the stock O2 sensors then just install. The downpipe area gets pretty hot so you want to run the lines in the stock clipping locations just to be safe and have an OE Type Fitment. Here is a pic with 2 options. I chose the one on the left and forum member Noushy is running the one on the right (he had installed his before the discovery of the one I am using) they both work fine and so far we both have no CEL.. so here you go:



Left: Bosch 16795
Right: Bosch 15167
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      08-25-2013, 11:22 AM   #56
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Hunter, where did you pick up your pin removal tool? Thanks for the pics and part numbers..


BB
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      08-25-2013, 12:23 PM   #57
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I had mine installed at the dealer so they had the tool there. I'm sure it's a simple tool and easy to find. I'm thinking mechanic shops should have it or something similar to use. Just explain what you need to have done. It's very simple.
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      09-05-2013, 12:15 AM   #58
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Hi Hunter5197,

Thx for your sharings, very useful.

I hav just ordered ams catted dp, do u need 1 bosch cable or 2 for better fitment?

BIG thx!!
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      09-05-2013, 12:18 AM   #59
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No Problem, you should buy 2.
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      09-06-2013, 08:24 AM   #60
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Quote:
Originally Posted by Hunter5179 View Post
No Problem, you should buy 2.
Thx a lot Hunter, like many other users here, u guys are great!!

I m from far away (China) but the valuable info. shared by you guys on this forum are magnificent. Thats what makes this forum so popular worldwide i guess.

It needs 2 cables, do u mean as below -

Left: Bosch 16795
Right: Bosch 15167

Thxxx again.
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      09-06-2013, 10:08 AM   #61
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No problem, you pick one of them and buy 2 of the same. I was just showing 2 different kinds of sensor options you can pick from. So whichever you choose buy 2 of the same.
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      09-07-2013, 05:44 PM   #62
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AMS Alpha-

The (new) donut gasket gets the chamfered face installed DOWN? so that it engages with machined chamfer on the exhaust?

Slight hi-jack...but I have this rattle with the RPI exhaust. What I am seeing is that the donut gasket is slightly extruding as the RPI flange is made up. This extrusion causes a slight gap between the RPI flange and spacer flange (stamped piece). This will then allow the spacer flange to vibrate between the RPI flange on the exhaust and the mounting flange on the engine.

The key in all this is getting the exhaust flange to completely mate up the engine bracket and firmly sandwiching the spacer flange.

Thanks,
Tom
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      09-07-2013, 07:00 PM   #63
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Quote:
Originally Posted by tmkhum View Post
AMS Alpha-

The (new) donut gasket gets the chamfered face installed DOWN? so that it engages with machined chamfer on the exhaust?

Slight hi-jack...but I have this rattle with the RPI exhaust. What I am seeing is that the donut gasket is slightly extruding as the RPI flange is made up. This extrusion causes a slight gap between the RPI flange and spacer flange (stamped piece). This will then allow the spacer flange to vibrate between the RPI flange on the exhaust and the mounting flange on the engine.

The key in all this is getting the exhaust flange to completely mate up the engine bracket and firmly sandwiching the spacer flange.

Thanks,
Tom
I've had the same sound since putting my GTS system on, but only at full boost and usually in 2nd or 3rd gear. I did order new gaskets and I'm hoping it fixes it.
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      09-07-2013, 08:23 PM   #64
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New gaskets did not solve the issue for me. My driver's side looks to be properly made up, but the passenger side still has a gap. This morning, I replaced the passenger side gasket with a (another) new one, except I ground more of a chamfer/lead-in on the gasket. This did reduce the gap once torqued up, but still had a gap. I did a couple runs this evening...the rattle is better, but still not gone.

Tom
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      09-24-2013, 10:14 PM   #65
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Quote:
Originally Posted by tmkhum View Post
New gaskets did not solve the issue for me. My driver's side looks to be properly made up, but the passenger side still has a gap. This morning, I replaced the passenger side gasket with a (another) new one, except I ground more of a chamfer/lead-in on the gasket. This did reduce the gap once torqued up, but still had a gap. I did a couple runs this evening...the rattle is better, but still not gone.

Tom

Tom, any updates on your rattle?
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      09-27-2013, 10:05 PM   #66
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I need to make a few more runs, but I think the rattle is nearly all gone. After a few heat cycles, I think the flanges moved closer together on the passenger side. I can also confirm that if you have this problem, re-torquing the bolts after a couple hundred miles does help. I plan on retorquing again and that will hopefully fix it for good.

I suspect that some of these problems on aftermarket exhausts may be due to the gasket pocket machined in the flange not being exactly the same as the factory...the pocket may be a little undersized and the gasket has no where to go.
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