Well the external stingers you are say are silincers..Updated pipes have a internal stinger installed which changes the pipes and makes the quiet..Sounds like have the 1st generation set.
I guess you still have that welded crank assy that has a bent rod you sold me??????????????? I hope you dont try and trade it to anybody!!@$$%$#%^$%^$%^*$^&%$*^&%