Jets

I may be a good idea to confirm with a plug chop, the breathing is going to be improved as the aftermarket silencer has little restriction to flow, but the stock pipe does create quite a bit of back pressure due to the baffles.

Better safe than sorry.
 
Take the stock silencer off and run an open stock pipe, you may notice a slight power increase.

Why, possibly it is breathing a little better, better breathing should be addressed by finding out if the jetting is correct for the increase of air that may be passing through the Venturi in the carb.

Too true I want him to, I get concerned whenever there is a slight chance of running a destructive lean mixture.:D:D:D

Better safe than sorry! This silly old fart has seen way too many engines destroyed by just one size too small jet.
 
I'll have you know i rode mine 3 miles with no silencer and the LRD pipe. i had it jetted rich to begin with though i believe.

and let me tell you, that beast sounded so sexy! like a monster truck in your helmet it was so loud without a pipe putting it out the back.
my brother wouldnt ride behind me, only lead