One of my exhaust tip is having a hard time flowing (passenger side). I believe the cause is a clogged catalytic converter as the exhaust rattles at around 3500-4000 rpm. How do I know for sure that this is really the cause? Will the coupe's cats fit my sedan? Is this an easy DIY? Thank in advance!

P.S. I searched the forum and didn't find a proper answer to this! Be easy on me! And I don't have access to a hydraulic lift. (like in mechanic's shops)

 

The Sedan Muffler and Coupe Mufflers both are attached by a single Pipe. If one tip is clogged that's something on the muffler.


It goes

Side 1 > Headers > Cats > Y Pipe\
--------------------------------> Midpipe > Muffler
Side 2 > Headers > Cats > Y Pipe/



Y-pipe, Midpipe, and the muffler are visible in this picture.

 

Ok thanks a lot for the fast reply!

 

If it's cool in the mornings where you are, you should know our stock sedan mufflers is only open on one side until the car has warmed up some, then a flapper opens on the other side (at least I think that's physicall how it works). The rattle could be in the muffler or may be unrelated -- check any potential points of contact between the exhaust system and the underside of your car.

 

You da man with da knowledge!!

I was just going to post the same info, DaveB talked about this a while back.

 

Ok ok because it actually gets quite cold in the morning up here in Quebec xD I wish I lived in a place where it never snows.. Thanks again BTW

 

There is NO flapper in the muffler. At least that I know of.

Flapper = electrical and there is no electrical parts in the muffler.
I experience this same issue with the HKS..

In my honest opinion, I believe it's FLOW:

Exhaust travels the fastest traveled path with that said you'll feel at idle one with more flow than the other, Untill the gasses inside the system are over higher than it can flow with 1 exit thus the other exit increasing velocity.

In other words:

At idle you'll feel 1

at higher RPM you'll feel both increase drastically and quite possibly normalize.

 

"Variable Capacity Muffler
A pressure valve automatically opens the exhaust flow wide at higher rpm to boost high-end power output and gives the G35 the growl of a hot rod. When rpm is reduced, as during idle, the valve adjusts to hush the muffler to nothing more than a soothing hum.

That is from the G35 description on Infiniti's site.
Wayne"

https://g35driver.com/forums/g35-sed...p-muffler.html

 

Actually the older 5th+ maximas had a dual chambered muffler that was NOT electricaly operated. The flap was flow operated. It only flowed though one side until the exhaust flow exceeded the flap pressure for the other side. Then it flowed though both sides. This is so the exhaust could have a bit of back pressure for the low end and open up at high exhaust flow. Probably for noise supression also.

 

Learning every day from this site I tell ya!