Bad Exhaust Install?

[NightKids]

New update: I went to Ringwood Performance exhaust today and they spent some time rewelding the back muffler part and tidied up some welds. Cost me $100, drove out and it's still making the noise! They said the noise is coming out of the muffler.

I then drove to Modproject for them to have a look and he reckons it might be my metal cat. I'm so confused!

Basically now I have the option to replace my muffler to an aftermarket one. I had changed the muffler to a stock EK4 one and it was still doing the same thing. I would take this approach if I believe that my DC2R muffler or EK4 can't handle the flow.

Change my cat to a ceramic one, i'm hesitant to do this cause my Magnaflow metal cat is brand new! I paid quite a lot of money for it.

Would there be a possibility this is coming from my Hot Dog resonator which the exhaust shop put in? How would I be able to tell of this is the problem?

[NightKids]

Anyone heard of magnaflow metal cats making vibration buzzing noise at certain rpms?

[DC2-PWR]

anyone heard of magnaflow metal cats making vibration buzzing noise at certain rpms?

3500rpm?

[NightKids]

Nope at 2500rpm for me. I have read that a few pol with 350Zs have rattles with a certain brand of metal cats.

I'm spewin' cause I read somewhere on ozhonda that a guy had problems with a stock muffler and aftermarket exhaust but I can't find that post anymore!

[DC2-PWR]

When you decelerate at that rpm (no foot on gas), can you still hear it?

[NightKids]

Nope it's only under acceleration but for me to really get the noise the gas pedal would be more than half in (semi-flooring it)

[NightKids]

Bump this up

[vinnY]

check all heat shields? I ended up removing all of mine to try and isolate it
I also found last time it happened to me it turned out to be little balls of metal from the bad welds that had heated up and broken on the inside
sounded like a bunch of rice being shaken inside a tin can

[NightKids]

I actually don't have any heat shields left on my car... there was something in the cat that was rattling and that's already been removed by Ringwood Performance Exhaust...

[mugen_ctr]

New update: I went to Ringwood Performance exhaust today and they spent some time rewelding the back muffler part and tidied up some welds. Cost me $100, drove out and it's still making the noise! They said the noise is coming out of the muffler.

I then drove to Modproject for them to have a look and he reckons it might be my metal cat. I'm so confused!

Basically now I have the option to replace my muffler to an aftermarket one. I had changed the muffler to a stock EK4 one and it was still doing the same thing. I would take this approach if I believe that my DC2R muffler or EK4 can't handle the flow.

Change my cat to a ceramic one, i'm hesitant to do this cause my Magnaflow metal cat is brand new! I paid quite a lot of money for it.

Would there be a possibility this is coming from my Hot Dog resonator which the exhaust shop put in? How would I be able to tell of this is the problem?

Its hard to tell man if it is infact the cat, since they pretty much chucked in a whole one piece pipe.... it would been heaps easier had they actually made it into a 3 piece cat back and not a single piece... worse comes to worse, u might need to hack up the exhaust and have a look inside with a torch to see if anything wrong.... Or u could get them to cut it up an weld up some flanges, but thats even more $$$$.... an buy that time, u coulda gotten a proper 2nd hand cat back system like buddy club

[NightKids]

What do you think if I got a place to reweld my standard cat back on to see if it still does it?

Do you reckon that might be worthwhile? That way I can use like a process of elimination...

[DC2-PWR]

What do you think if I got a place to reweld my standard cat back on to see if it still does it?

Do you reckon that might be worthwhile? That way I can use like a process of elimination...

reweld? arn't cats meant to be bolted on both sides?