I had a custom y-pipe fabbed up and works awesome.
The only problem is that I wish I didn't get CARSOUND cats. I have blown out (not clogged) the honeycomb on both the left and right cats. The passenger side went within 2 weeks and the drivers side within a week after that. My car is runs mint and I know its not my car. The shop I had the work done at says its my car. Its fairly obvious that the shell around the inside is disintegrating; comes out as powder when we pulled the cats.

I'm thinking that this shop used a low CID cat converter. Its the only possible reason.

Any of you guys had the same problem?

 

I've used 2 carsounds on my 2 LT1s. Never had a problem. They are high quality. I bet they got damaged during shipping or someone dropped them.

 

That is a possibility. If this happens again, I'm going to pull them get my money back and run an ORY.

What part number cats did you use? I want to check with the shop to see which ones they used. There are 2 2.5" carsounds on the y-pipe if that effects anything. Could the velocity from my 3" outlet from my headers reduced to 2.5" tubing.

 

Seems weird. I have a single 3" Carsound cat, and it sees more velocity than either of your 2.5" cats, since it's after the Y-pipe, and I've had no problems. Looks brand new. I just had it off a couple of days ago after about 4000 miles, and the inside looked great.

Dan

 

Two 3" carsound cats on my ypipe... Work great no complaints here. look fine too.

 

one 3" inch Car sound cat for one year with no problems.

 

Ditto.... a pair of 3" CarSounds, pushing 635HP w/N2O.... no problems.

 

Do you think I just got a bad batch or what?
I noticed that the y at the collector is really close to my tunnel brace, could that be vibrating and break loose the honeycomb inside the cat?
What other possibilities could cause this?