Mine ticks like fricken woody woodpecker after I shut it off. Wack sauce.

 

My car is a about 3 months old (my XM just expired) and i've got just about 1,500 miles on it and i guess one of 2 things is going on:

1. either i'm not noticing the muffle rattle
2. I got lucky and my muffler isnt defective like so many out there.

Can someone tell me exactly what i should be listening for? Usually i've got my music up pretty loud so that could be why i'm not hearing any muffler problems (assuming I even have any)

 

It would be most noticable when you first start your car in the morning... it would sound like little chunks of metal flying around your muffler..

 

I had mine replaced in Febuary and I have Stillen HFC and I've had no probloms with my exhaust.

 

The ticking that you hear when you cut the car off is from the expansion and contracting of hot metal- likely heat shields and manifold (just a guess).

The imfamous rattling from the muffler is from broken or worn our baffles in the muffler.

 

In addition to what Terrible said, it normally appears after you first crank it and let it idle for about 30 saeconds to 1 minute. As it begins to change from cold start mode to normal driving mode you will hear the rattle from the muffler.- that is if you have the problem.

 

I have an appointment for Tuesday. They are removing my high flow cats and placing my OEMs back on and then testing to see if the problem returns.

I'm not sure how we are going to go about all of this but I guess I will be the ginny-pig for now since Infiniti agreed to do this to no expense to me if they find that after removing the HFCs the rattle is still there after putting on my OEM cats.
If the rattle is still there I assume that they will replace the muffler and put my HFCs back on if thats what I want to do, or let me drive for a while with the OEM setup to see if the rattle comes back. I may just keep the HFCs off until my Tanabe mufflers arrive.

 

I have the same problem. I don't have HFC's or any mods. I'm going on my third muffler right now. Same stuff, rattles and all.

I was thinking... Who would make something that is very cheap, made of inferior materials, breaks often, etc. Who would a company like Nissan go to to save the most money up front. China! Give yourself a pat on the back if you guessed right.

Now read this article:
http://english.people.com.cn/90001/9...4/6382165.html

"The recall is due to problems in the muffler welding production process. Some cars did not have a particular type of wire bonder, resulting in corrosion-prone welding parts which crack and make an abnormal sound..."

I know it doesn't mention our cars specifically but is does mention the same issue. If Nissan outsourced Maxima mufflers, why wouldn't they do it for the rest of their cars? So, it seems that we are pimping Dongfeng mufflers on our G37's. It might be incorrect, but I think it is correct. I think the boys from Nissan wanted to cut some corners and save a few bucks in an area they didn't think mattered. Well, that one might have come back and bit them in the ***. So, next time somebody asks, "What kind of exhaust is that? Is it Greddy, HKS, or FI?" You can reply, "No man that's the Dongfeng Sport exhaust! Sounds hot right?"

 

lol! Wow interesting find... Dongfeng Mufflers huh? Hmmm.... I guess I must not have a Dongfeng considering I've never gotten the rattle... and I'm at 9200 miles already...

 

WOW! that's interesting. I didn't see where they were outsourcing Maxima mifflers though(?)

I'm rockin' a DONG FANG!

HA!

 

Just because it has Nissan and muffler in the same sentence doesnt mean its the same issue. This is a huge assumption.

 

or Injen exhaust especially for those of us that want to brand match with the intake...

i really think u got a factory defect freak manim sorry about that seems u have severe issues that go beyond the typical ones, good luck lemoning! are u still getting a G37 after? you can probably get a newer build by now...


Trader J you're hilarious...i think what u found might be on the dot...not only do those chinamen prob F up small standard exhausts, Nissan prob did one worse and tried to give them specs on a premium/sports exhaust which i would imagine needs more attention to engineering and details.....

PS
I meant chinamen as synonymous with Chinese people. not to be confused with the semi-derogatory term

dont get too excited u just have a better built Dongfeng muffler...inferior factories like these in China are known to have inconsistent build quality so out of every 100 mufflers made, 70 may be up to par, 20 with moderate issues or vulnerable to issues and 10 that end up sounding like a tin can.

 

http://en.wikipedia.org/wiki/Nissan_Teana
It mentioned a Teana being am Aussie Maxima in another article. Not quite the same but close. Looks kind of like a Q45 perhaps. The point is that Nissan has some mufflers made in China that are going bad.


It sure sounds like the same issue to me. You would be surprised how much China-made stuff is around you at any given moment. It would make sense if you wanted to roll the dice with quality and save a bundle on manufacturing. Especially in light of the increased prices of industrial metals worldwide, I can see not only Nissan doing this, but the others as well.

I might be wrong, but who knows? I do know that these mufflers suck (repeatedly) and if I had to pick a random country capable of manufacturing such excellence, I would choose China. They can't even make dog food right without killing our pets.

 

Believe me you wil know if you have the problem.

When you start up, you will hear rattling sound(sounds like metal screws/loose license plate from very loud stereo system)

Very distinct rattle, had 4 mufflers done before problem went away.

It's back (muffler sound) & since then I already ordered a new cat back & hfc's from FI.

 

800.662.6200 dial 7
infiniti said go to dealership and get it replaced...they said they have to see more people complaint about muffler to recall g37