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      06-19-2012, 08:50 PM   #23
WickedNy
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After hearing that clip, I'm extremely interested in getting this set up, but I have two questions.... Do you think this would void the warranty and secondly would the parts be the same as well as the setup for the coupe ?
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      06-21-2012, 08:29 PM   #24
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Anyone?
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      06-22-2012, 09:45 AM   #25
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Quote:
Originally Posted by WickedNy View Post
After hearing that clip, I'm extremely interested in getting this set up, but I have two questions.... Do you think this would void the warranty and secondly would the parts be the same as well as the setup for the coupe ?
No difference between the coupe and roady. As far as the warranty goes, my guess is it would probably void some part of the warranty as far as BMW is concerned. The issue (I think) would be the removal of the secondary cats to make room for the muffler in the tunnel space. Even though the secondary cats do not have any sensors associated with them and in theory have no effect on the engine management system, many states prohibit their removal like CA. Altering any aspect of a car's factory installed pollution control device/system is an automatic fail.

Reading through the various threads, it appears that removal of the secondary cats makes no difference at the tail pipe and probably cleans up the exhaust gas flow somewhat. For those who can, I think it's a great mod for sound quality with the added benefits of low cost and a little weight savings.
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      06-22-2012, 03:28 PM   #26
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Thanks for the reply seems like I'm going to go fwd with it within the next few weeks or so
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      07-31-2012, 10:29 PM   #27
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looks like they fabricated the dual pippings also? what diameter size are they?
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      07-31-2012, 11:24 PM   #28
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wow the 3.0si responds VERY well to an exhaust mod...that sounds clean!

i actually spoke with Nelson at mighty muffler a month or so ago about custom fabbing my section 1. i'm not ready yet because i'm not sure what resonators to go with.
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      08-28-2012, 09:54 PM   #29
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OK, very confused...is what was removed a cat or just resonators? Or, is there even a difference?

I would like this setup but I am told that if I remove cats in Ontario that its a potential $20k fine (that's from a reputable muffler shop). If its just resonators, then this should not have anything to do with emissions system, correct?
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      08-29-2012, 09:18 AM   #30
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OK, very confused...is what was removed a cat or just resonators? Or, is there even a difference?

I would like this setup but I am told that if I remove cats in Ontario that its a potential $20k fine (that's from a reputable muffler shop). If its just resonators, then this should not have anything to do with emissions system, correct?
Over the years and various forums I have asked this question and to be honest, haven't received a definitive answer. Some people refer to them as secondary cats and that seems to be the consensus, others as resonators. If they are cats, then we have to live with them, if resonators then they can go.

The intriguing aspect is that there are no sensors associated with these which would suggest that they are resonators. The 3.0Si differs from the M in exhaust design so the M folks can't really help us here. What needs to be done is for someone who has removed them to look inside, or preferably to section one and report to the forum. Pics would be great!

Removal of these with the install of a larger volume resonator/muffler in the tunnel is a great mod, itís clean, simple, inexpensive, and produces the desired increase in volume without resonance.

So I ask again: Has anyone removed these and looked inside? A grateful forum awaits!
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      08-29-2012, 11:37 AM   #31
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Those "resonators" are cats. There's a section of cats in the headers, and a section that you see in the OP's first post before the axle-back section. No sensors connect pre or post "secondary" cat section on other BMWs (or the M) for that matter.

See Realoem. Here's a link.

Now whether the car could pass a tailpipe smog check without the "secondary" cats is another question. As for an OBDII readiness check, since there are no O2 sensors around the "secondary" cats, it's not going to affect that. The only issue would be passing a visual test.

In the US in CA, the tailpipe test is to be replaced in 2013 by an ODBII readiness check, so the rules have changed. Things changed with AB229, section 44012. Aside from the issues with the visual check, removing these may not pose the problem they would have at one time since this section isn't monitored by the ECU.
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      08-29-2012, 12:02 PM   #32
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Quote:
Originally Posted by Finnegan View Post
Those "resonators" are cats. There's a section of cats in the headers, and a section that you see in the OP's first post before the axle-back section. No sensors connect pre or post "secondary" cat section on other BMWs (or the M) for that matter.

See Realoem. Here's a link.

Now whether the car could pass a tailpipe smog check without the "secondary" cats is another question. As for an OBDII readiness check, since there are no O2 sensors around the "secondary" cats, it's not going to affect that. The only issue would be passing a visual test.

In the US in CA, the tailpipe test is to be replaced in 2013 by an ODBII readiness check, so the rules have changed. Things changed with AB229, section 44012. Aside from the issues with the visual check, removing these may not pose the problem they would have at one time since this section isn't monitored by the ECU.
Tks. I may be wrong, but it seems (IIRC) that the part description has changed at some point in time. Regardless, good info and resolves the issue. Things could get interesting come 2013 in regards to AB 2289.
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      08-29-2012, 03:41 PM   #33
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Any advice on muffler tips? Which kind? Where to buy?


EDIT:
Just watched the vid again. I can't get enough of it. I can't believe it only cost $600. Sounds awesome.
I am also curious. Are there any name brand exhaust tips or anything? Also, where would i look for these?
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      08-29-2012, 04:47 PM   #34
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Hey guys sorry I havent been around to answer your questions. i actually sold the Z last week and bought this...

2012 EVO X

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      08-29-2012, 10:33 PM   #35
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Quote:
Originally Posted by Incompatible View Post
Tks. I may be wrong, but it seems (IIRC) that the part description has changed at some point in time. Regardless, good info and resolves the issue. Things could get interesting come 2013 in regards to AB 2289.
Section 1 pipes For US specced cars

03-05 they are mufflers/silencers. Cats are in headers

06-08 facelift they are CATS. Cats are in both headers AND section 1
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      09-04-2012, 02:02 AM   #36
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Hey guys sorry I havent been around to answer your questions. i actually sold the Z last week and bought this...

2012 EVO X

Nice! How ya like it?
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      09-17-2012, 12:03 PM   #37
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Nice! How ya like it?
OHHH man I love it.. I just bought a COBB AP and upgraded to Stage 1... damn this thing is fast.....
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      09-24-2012, 02:39 AM   #38
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Great Sounds!!!
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      05-20-2013, 12:49 PM   #39
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Magnaflow 12468 won't work on 2006 z4 3.0si

Guys,

Have any of you attempted this setup on a 2006 z4 3.0si?

I bought this muffler (Magnaflow 12468) and went to my exhaust shop, they told me there is not room for it to fit. In the photos of this post is shows much more room. I don't understand how that is possible, unless between a 2007 and 2006 they changed the under body of the car.

Any clue?

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      05-20-2013, 02:07 PM   #40
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Quote:
Originally Posted by Paul_B View Post
Guys,

Have any of you attempted this setup on a 2006 z4 3.0si?

I bought this muffler (Magnaflow 12468) and went to my exhaust shop, they told me there is not room for it to fit. In the photos of this post is shows much more room. I don't understand how that is possible, unless between a 2007 and 2006 they changed the under body of the car.

Any clue?

If you retain the secondary cats, then no way it will fit. The only way that size muffler will fit is by removing the secondary's. Keep in mind that some shops will not remove the secondary cats even though they have no sensors.
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      05-20-2013, 02:41 PM   #41
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I brought the pics at the beginning of this post, and even after removing the secondary cats / resonators they said the muffler would not fit. They showed it to me in the air and I tend to agree. The width of the magnaflow 12468 is 8 inches, it looks like the opening is right at 8 inches. So, it might fit but there would be all kinds of noise / rubbing. Something does not add up. Thinking the part number on this original post was wrong.
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      05-20-2013, 06:09 PM   #42
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Quote:
Originally Posted by Paul_B View Post
I brought the pics at the beginning of this post, and even after removing the secondary cats / resonators they said the muffler would not fit. They showed it to me in the air and I tend to agree. The width of the magnaflow 12468 is 8 inches, it looks like the opening is right at 8 inches. So, it might fit but there would be all kinds of noise / rubbing. Something does not add up. Thinking the part number on this original post was wrong.
There have been others who have posted their install using the Magnaflow 11378 muffler, 9in wide and 11in body length. The Z tunnel is generally trapezoid in shape, narrower at the top then bottom. From what you could see, was the problem in overall length or was it the muffler sitting to low?
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      05-21-2013, 07:41 AM   #43
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The problem with the 12468 appears to be a problem of width (8 inches) not length, the muffler you mention is even wider at 9 inches. I know you say it is trapezoid in shape, but it looks even like a tougher fit. Those that used the 12468 must have a different year car than mine with less room for the width?
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      05-21-2013, 09:00 AM   #44
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Quote:
Originally Posted by Paul_B View Post
The problem with the 12468 appears to be a problem of width (8 inches) not length, the muffler you mention is even wider at 9 inches. I know you say it is trapezoid in shape, but it looks even like a tougher fit. Those that used the 12468 must have a different year car than mine with less room for the width?
It's been a while since I've been under my car, but I think that the 12468 would fit if it was positioned low enough in the tunnel, the downside being loss of ground clearance. Went back and looked at the first pics and the muffler appears (difficult to see) to sit lower than the secondary cats originally did. We don't need to give up any ground clearance with as low as our cars sit.

Last edited by Incompatible; 05-21-2013 at 09:08 AM.
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