I just purchased a slighty used pipe from a dealer closing his doors. It also came with the power core silencer/spark arrestor. Do I need to rejet the bike after I install this pipe? Also, I have seen some of these pipe with an adapter in between the torque pipe and the silencer. this doesn't have one. Do I need it?

 

definitely need to rejet it and a good start is about 120 main jet. If your gonna expect more speed, it wont even make a difference except for sound. (I started out just like you and $$$ later now the quad hauls).

 

120?? WOW
I'd run the stock jets and see how the plug looks.