Notices
RX-8 Discussion General discussion about the RX-8 that doesn't fit in one of the specialty forums.

Cat rattle. What are my best options?

Thread Tools
 
Search this Thread
 
Rate Thread
 
Old 07-21-2019, 12:36 PM
  #1  
Registered
Thread Starter
 
powderedtoast's Avatar
 
Join Date: Dec 2015
Posts: 36
Likes: 0
Received 2 Likes on 2 Posts
Cat rattle. What are my best options?


There is a terrible rattle / marbles in a can sound coming from the circled portion. I assume this means I need a new cat or to switch to a mid pipe. My Mazda muffler seems fine, so I was thinking about installing the BHR midpipe or maybe trying to gut the cat.
Old 07-21-2019, 01:23 PM
  #2  
Smoking turbo yay
 
UnknownJinX's Avatar
 
Join Date: Apr 2017
Location: BC, Canada
Posts: 3,117
Received 671 Likes on 596 Posts
The only way to be sure is to remove the cat and have a look in there.

If you have to worry about the emissions and/or the smell, get a used cat from a junkyard or someone here.

Otherwise you can just gut it.
Old 07-24-2019, 08:38 AM
  #3  
What am I doing here?
 
NotAPreppie's Avatar
 
Join Date: Mar 2006
Location: 2017 Miata RF Launch Edition
Posts: 3,606
Received 649 Likes on 510 Posts
That section is the resonator. It can collect debris from the cat as it disintegrates.

Before throwing money at the problem, disconnect the front of the midpipe from the exhaust manifold (3 nuts), and tilt it down so you can have a look inside. You may need to remove the middle and rear cross members (4 bolts) to get enough clearance.
Old 07-25-2019, 05:44 AM
  #4  
RX-Heaven
iTrader: (6)
 
mazdaverx7's Avatar
 
Join Date: Sep 2008
Location: Vermilion Ohio
Posts: 2,149
Received 191 Likes on 157 Posts
Also, ensure the heat shield around the catalytic converter is not loose, causing the rattle you are hearing. A loose heat shield can cause that sound.
Old 08-04-2019, 09:33 AM
  #5  
Registered
Thread Starter
 
powderedtoast's Avatar
 
Join Date: Dec 2015
Posts: 36
Likes: 0
Received 2 Likes on 2 Posts
Ended up going with the BHR catless midpipe, and I am very glad I did.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
chernasty
NE For Sale/Wanted
5
06-24-2015 12:42 PM
Brick Squad Jerm
New Member Forum
1
05-29-2014 09:41 PM
Unhooked
RX-8 Discussion
3
09-13-2013 07:11 AM
Blk1.3
New Member Forum
6
06-25-2013 06:12 PM



You have already rated this thread Rating: Thread Rating: 0 votes,  average.

Quick Reply: Cat rattle. What are my best options?



All times are GMT -5. The time now is 01:10 AM.