There are actually several Pat, but some of them are not illustrated. Here are the illustrations:
![[Linked Image]](https://www.outdoorking-forum.com.au/forum/uploads/usergals/2013/07/full-2772-11604-bs_80102_optional_mufflers_1.png)
Here are the part numbers:
![[Linked Image]](https://www.outdoorking-forum.com.au/forum/uploads/usergals/2013/07/full-2772-11605-bs_80102_optional_mufflers_2.png)
P/N 392811 looks to be the same as your old muffler.
P/N 89966 is probably the long, symmetrical tubular muffler shown in the illustration.
P/Ns 292064, 295905, & 297934 are used on various other versions of the 80102 but are not illustrated.
P/N 91810 is a 45 degree exhaust elbow.
P/N 91943 is a 90 degree exhaust elbow.