Quick Exhaust Problem Question

[mjscar]

Hey guys I just got a quick question about my exhaust. Recently my exhaust have started to sound really bad. Like at lower-ish RPMs, there would be a slight rattle coming from the back of the car. So I got under my car and started inspecting the heatshields and whatnot for any loose items that could potentially rattle. However, it turned out that there are rocks???? in my exhaust. When I swing my exhaust side to side, I just hear these clattering noises from inside!

What could this possibly mean??

Is it a collapsed muffler, my cat breaking down or something else? If (hopefully) it is just the cat, is it just a simple case of taking the exhaust off and try to get the debris out or has it potentially damaged the inside of the muffler?

Thanks for your help guys. Hopefully I can get this fixed soon because it absolutely sounds horrific when I put my foot down now.

[WESTWD]

i had the same problem on my old pintara i know your pain, it sounds like complete ass and you are embarressed to drive anywhere lolz...

im 98% its the cat mate take it to an exhaust shop and ask them to check it for ya, shouldn't cost you anything.

peace.

[Victory]

Yeah - sounds like the core of the cat has broken up and is rattling around.

I had the same problem with my GTR and depending on how the pieces were sitting it either sounded crap or was quite loud.

[mjscar]

ahhh awesome doesn't sound like a huge problem I guess.

Phew!

Like you guys were saying, I am completely embarassed to drive it around sounding so crap. There is a really small revband between 2000-3000 RPM right now where it doesnt make such a crap sound. Not so fun being restricted to that in a skyline hahah.

Now I just have to drive it around like a granny till exams is over in 2 wk. ugggh!

Cheeers guys! Much appreciated!

[mad082]

also check that there aren't any broken manifold studs as the gasket flapping around can make that noise too.

[mjscar]

Just an update, I took the cat and cat-back off this wkend. Turned out that my cat was fine

So then I turned my attention to the cat-back and I can definately hear rocks/sands in there rattling around when I shake it around. However, no matter how hard I shook or tapped it, the stuff inside just wouldn't come out. So now I'm starting to think that the muffler might just start to collapse on me. Sigh. And I thought this was going to be a quick backyard job. Now I have to bring it into the exhaust shop and see if they can put a new muffler on it.

Any idea how much mufflers are roughly?