I did too, gixxer6....made me look again. Oh, good grief, Charlie Brown...I'm going cross-eyed in my old age....I'm looking at the wrong thing a couple times..looking at the y pipe numbers by mistake....."MANIFOLD, exhaust"...in the parts diagram.
START OVER!!! Hopefully, the pictures showed up.. that I added above.
1979----(and 1978) "MUFFLER ASSY, tuned"!!!!
Both Invaders....39083-3501
Intruder.....39083-3502
1980
340 Invader....39083-3501
440 Invader....39083-3506
440 Intruder....39083-3505
1981
440 Invader....39083-3506
440 Intruder....39083-3513
!!!!Sorry for the confusion
Maybe I should go try to balance my checkbook....or something