...Does installation void my bike warranty?
In a nut shell, and not beating around the bush, yes. But reading further into your warranty book reveals the problem with an immediate "yes" to this question.
"Any" aftermarket products installed on a bike, not approved by the motorcycle manufacturer will usually and unequivocably void your warranty. This means "ANY". If you install a tank bag and your motor fails, the manufacture could say the extra drag caused additional load and failed the motor beyond the normal use. This is an extreme case and not politically correct, but literally "any" from the manufacturer means "any". You should check with the bike manufacturer to see what is and is not covered on your warranty.
Since the inception of STAINTUNE in 1980, there has not been one single case where an exhaust system has caused a motorcycle to fail in any way. The designs from STAINTUNE does not so radically change the behavior and nature of the bike for it to be of any concern.