MarkD

as Paul said... and Jeff's advice is good

or, if you have the tip off or want to remove it to find out, you can tell by the type of outlet pipe: http://fdmotorsports.net/BischoffGillet.jpg

brucec59

A '79 would be Gillet. Also, the connection to the cat is round vs oval for the Bischoff.

01coccobet

I jump back to say thank you....
better late than never.
sorry for the delay.
I found-out I had quite strange mufflers
they wheighted the same 5.4kgs as RSR,but aren't M159's.
the sound is quite similar....
993.111.045/046.05
I'm still searching the ultimate 993 sound perfection,but I'm almost there!
cheers

koebel

I have the bigger chrome tips and the modified airbox on my 993 and a pretty mean exhaust sound.... So my suspicion has always been that I also have different mufflers. I just tried to look up the numbers on the mufflers to double check, but can not find them. Are they visible without removal? If yes, where to look?
Thx

01coccobet

they are stamped on each side of the mufflers,perfectly readable when installed,
just look on each outer part of them,from the lateral part of the bumper

koebel

might be me, but I can not locate any numbers. see picture:

Non-stock parts mabye?