Chain Adjustment??

No!

If you check alignment and torque up correctly you can use a small punch mark to consistently align and tighten the spindle without removing the silencers. A long extension bar on an 8mm socket then allows you to adjust both sides equally using quarter/half turns.

 

FYI. I use the tool below to check chain alignment. Low cost tool and more accurate then using the notches on the frame. Also I have a Street Twin and I don't have to remove the silencers on my bike.