Do I need a new Muffler?

[seafood10]

Engine is out right now. When I separated the Cat from the Muffler black ceramic chunks came out of the cat so I ended up clearing the rest of the material from the inside, all the mesh and ceramic came out easily.
So I am wondering if the breakdown of the cat has ruined the muffler.
Also, as you can see from the picture somehow the cat got a serious dent, can this be repaired and used as a cat bypass or should I just get an M&K bypass?
It's an 84 with 105k miles.
Appreciate the help!

(PS: Jim I didn't want to bug you on a Sat.)

[Mark Salvetti]

The last post in this thread suggests the dent is factory, to clear the lower shock bolt:
Euro pre muffler

Mark

[seafood10]

Originally Posted by Mark Salvetti

The last post in this thread suggests the dent is factory, to clear the lower shock bolt:
Euro pre muffler

Mark

Huh, seems like it is as what are the chances that mine has the same 'dent' as others do?
My initial thought was that it is causing back pressure but I guess it is intentional.
Thanks.

[roper0621]

I. have a M&K by pass for sale, $200_

[seafood10]

Originally Posted by roper0621

I. have a M&K by pass for sale, $200_

Can you send me pics and some info about it please.

[roper0621]

PM sent

[RarlyL8]

Yes that "dent" is factory and yes it is restrictive. Reason for it is to clear the shock mount on the M491 optioned Carrera.

.

[GenX Porsche]

If you need to justify the spend to the significant other then you definitely need a new muffler. I got my m&k gt3 and headers being built as we speak...

[seafood10]

Originally Posted by RarlyL8

Yes that "dent" is factory and yes it is restrictive. Reason for it is to clear the shock mount on the M491 optioned Carrera.

.

Hi, If I am not Mistaken the M491 options are for the Turbo Look. I have a Cabriolet that does not have a Whale Tail or anything else that I believe is a Turbo Look.
It is a standard Carrera with a MFG date of 10-83, must have been right when they switched from the SC, and I believe the only option is the LSD diff.
Is this 'dent' factory, I can't imagine how it would get there otherwise?

I appreciate your feedback as I am really confused.
Thanks

[seafood10]

Originally Posted by roper0621

PM sent

Hi, I did not get your PM, can you please try again.
Thanks!

[RarlyL8]

M491 began in 1984 and the "dent" in the premuffler/cat followed. Porsche put them on non-M491 models which seems logical as it reduces the need for two different versions.

[roper0621]

Originally Posted by seafood10

Hi, I did not get your PM, can you please try again.
Thanks!

Forward me your email and I will srnd pictures.
Wayne

[roper0621]

Originally Posted by roper0621

Forward me your email and I will srnd pictures.
Wayne

Or your cell phone number
Wayne