This was on my '90 Legacy Turbo (swap).

 

I have a 'universal' CC, 3" In/Out, I bought online 2 years ago. It's directly behind a 3" bellmouth downpipe.

 

When I pulled off my exhaust I heard some rattling.

 

The below 'briquets' came out.....Uh, WTH?

 

Any input is appreciated.

 

Here's look inside to the back of the CC:

 

Magnaflow Hi-flow Cat (94139) Pic:

Thanks,

Td

Edited February 7, 201115 yr by wtdash

Yep - cat's broke. That can happen with vibration or just from age - the "honeycomb" is very brittle. A good smack will crack it easily.

 

GD

The rest of those chunks are stuck in the muffler, give it a shake too.

 

Impact or backfiring in the exhaust can do that too. Reminds me that I need to take the cats out of my truck and shake the pieces out, it retarded the timing to TDC when it set a knock sensor code. I was illegally towing a forester home so I just held it to the boards and kept going. The cat got torched.