A32 Cat Converter issues
06-29-2014, 04:52 AM
#1
Newbie - Just Registered
Thread Starter
Join Date: Jun 2014
Location: Canberra, Australia
Posts: 1
A32 Cat Converter issues
Hi guys,
I'm new here, so please go easy on me with this
I have an Australian 98 A32 30G Maxima and about a week ago I noticed what can only be described as a high-pitched screeching noise that I think my be air passing through the baffles in my stuffed cat converter whenever going over about 10km/h or 1500rpm's.
I come to this conclusion because a) The noise comes from about the location of the car the cat is located, and b) about 2 - 3 years ago I was told by an exhaust shop that the cat was eroding quite badly.
It almost sounds like it would be the sound of the suspension about to give up, but I would think if this was the case it would be more of a constant noise instead of being at certain speeds.
My questions are:
From others experience (and from my poor description) does this sound like a likely guess?
Also, I currently have an aftermarket exhaust from the stock cat all the way back installed. If I was to ask while getting the cat looked at if it could be replaced with a hi-flow cat I would be laughed at? I realised it isn't the type of car people modify the exhaust on, but I enjoy the note.
Currently the exhaust is a little droney. Would a hi-flow cat add to this drone, or does it produce a different sort of noise generally? I'm a little ignorant when it comes to this sort of thing.
Any input would be greatly appreciated.
I realise most here are from the States. Not sure is there is much difference in the setup of the exhaust in the Australian Maxima to the States version?
I'm new here, so please go easy on me with this
I have an Australian 98 A32 30G Maxima and about a week ago I noticed what can only be described as a high-pitched screeching noise that I think my be air passing through the baffles in my stuffed cat converter whenever going over about 10km/h or 1500rpm's.
I come to this conclusion because a) The noise comes from about the location of the car the cat is located, and b) about 2 - 3 years ago I was told by an exhaust shop that the cat was eroding quite badly.
It almost sounds like it would be the sound of the suspension about to give up, but I would think if this was the case it would be more of a constant noise instead of being at certain speeds.
My questions are:
From others experience (and from my poor description) does this sound like a likely guess?
Also, I currently have an aftermarket exhaust from the stock cat all the way back installed. If I was to ask while getting the cat looked at if it could be replaced with a hi-flow cat I would be laughed at? I realised it isn't the type of car people modify the exhaust on, but I enjoy the note.
Currently the exhaust is a little droney. Would a hi-flow cat add to this drone, or does it produce a different sort of noise generally? I'm a little ignorant when it comes to this sort of thing.
Any input would be greatly appreciated.
I realise most here are from the States. Not sure is there is much difference in the setup of the exhaust in the Australian Maxima to the States version?
06-29-2014, 07:20 AM
#2
Senior Member
Join Date: Jan 2011
Location: Central AR
Posts: 3,041
Welcome to Maxima.org. Earlier this year, my 99 Maxima cats were found to be severely cooked/clogged. The car would barely run at times and it was extremely hard to start.
To determine if clogged cats were part of the problem, I temporarily removed the O2 sensors so the engine could breathe, then started it and took it for a drive. While it was loud, opening the O2 sensor holes made a huge difference in the vehicle's performance. So it was just a matter of replacing the upstream pre-cats and stock pipes with a Y-pipe (e.g. pre-cats deleted) and installing a Magnaflow high-flow cat to resolve the problems I experienced last winter.
Since the car had already had the rear suitcase muffler removed and replaced with a straight pipe, it was noticeably louder than stock but not too loud. The OEM resoonator has since been replaced with a glass pack and an open exhaust pipe with s silencer. The silencer does a good job of keeping the noise level legal.
There are a couple of y-pipe and options that you will see members post success stories on this forum. I would search the forum on y-pipe and high-flow cat to check out the discussions.
To determine if clogged cats were part of the problem, I temporarily removed the O2 sensors so the engine could breathe, then started it and took it for a drive. While it was loud, opening the O2 sensor holes made a huge difference in the vehicle's performance. So it was just a matter of replacing the upstream pre-cats and stock pipes with a Y-pipe (e.g. pre-cats deleted) and installing a Magnaflow high-flow cat to resolve the problems I experienced last winter.
Since the car had already had the rear suitcase muffler removed and replaced with a straight pipe, it was noticeably louder than stock but not too loud. The OEM resoonator has since been replaced with a glass pack and an open exhaust pipe with s silencer. The silencer does a good job of keeping the noise level legal.
There are a couple of y-pipe and options that you will see members post success stories on this forum. I would search the forum on y-pipe and high-flow cat to check out the discussions.
Last edited by CS_AR; 06-29-2014 at 09:00 AM.
06-29-2014, 04:57 PM
#4
Banned
Join Date: May 2013
Location: south east conn.
Posts: 253
Do you remember what you paid for the whole sysytem that u posted these pics of? i think im gonna be replacig mine before winter..i just wanna know a round about price for what u shown? i have a feeling im gonna need a cat also!
06-29-2014, 07:35 PM
#5
the welding ($25), and a Magnaflow tip ($50) Total:$375-400
http://www.mandrelexhaustsystems.com...EXHAUST/Detail
07-04-2014, 07:48 AM
#6
Hi guys,
I'm new here, so please go easy on me with this
I have an Australian 98 A32 30G Maxima and about a week ago I noticed what can only be described as a high-pitched screeching noise that I think my be air passing through the baffles in my stuffed cat converter whenever going over about 10km/h or 1500rpm's.
I come to this conclusion because a) The noise comes from about the location of the car the cat is located, and b) about 2 - 3 years ago I was told by an exhaust shop that the cat was eroding quite badly.
It almost sounds like it would be the sound of the suspension about to give up, but I would think if this was the case it would be more of a constant noise instead of being at certain speeds.
My questions are:
From others experience (and from my poor description) does this sound like a likely guess?
Also, I currently have an aftermarket exhaust from the stock cat all the way back installed. If I was to ask while getting the cat looked at if it could be replaced with a hi-flow cat I would be laughed at? I realised it isn't the type of car people modify the exhaust on, but I enjoy the note.
Currently the exhaust is a little droney. Would a hi-flow cat add to this drone, or does it produce a different sort of noise generally? I'm a little ignorant when it comes to this sort of thing.
Any input would be greatly appreciated. I realise most here are from the States. Not sure is there is much difference in the setup of the exhaust in the Australian Maxima to the States version?
I'm new here, so please go easy on me with this
I have an Australian 98 A32 30G Maxima and about a week ago I noticed what can only be described as a high-pitched screeching noise that I think my be air passing through the baffles in my stuffed cat converter whenever going over about 10km/h or 1500rpm's.
I come to this conclusion because a) The noise comes from about the location of the car the cat is located, and b) about 2 - 3 years ago I was told by an exhaust shop that the cat was eroding quite badly.
It almost sounds like it would be the sound of the suspension about to give up, but I would think if this was the case it would be more of a constant noise instead of being at certain speeds.
My questions are:
From others experience (and from my poor description) does this sound like a likely guess?
Also, I currently have an aftermarket exhaust from the stock cat all the way back installed. If I was to ask while getting the cat looked at if it could be replaced with a hi-flow cat I would be laughed at? I realised it isn't the type of car people modify the exhaust on, but I enjoy the note.
Currently the exhaust is a little droney. Would a hi-flow cat add to this drone, or does it produce a different sort of noise generally? I'm a little ignorant when it comes to this sort of thing.
Any input would be greatly appreciated.
I realise most here are from the States. Not sure is there is much difference in the setup of the exhaust in the Australian Maxima to the States version?
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