What year(s) is this muffler from?

[paslantnose]

The pelican parts lists have 3 different turbo mufflers listed BUT, all three show the same exact picture.
Can anyone tell me the correct year(s) for the muffler i have pictured here ???

[paslantnose]

Surely, someone knows what year(s) this muffler is from ???

[Geo9146GT]

That muffler is for the 86-89 911 Turbo with cat converter.

[paslantnose]

Geo9146GT, THANK YOU !

This is what had me screwed up, the parts list (pelican) shows a listing for '76-'77 and, a listing for '84-'89 with each listing having a different PN yet, both show pictures of the EXACT same muffler ?

MUCH appreciate your help sir !!!

[Emission]

Yep, identical to my '86 (and the black test pipe in the pic has replaced the CAT).