i got a gyt-r aluminum silencer and i love it. i rode it to see what the sound was like and so on (new toy wut u expect)

ne ways do u really have 2 rejet it runs great and i dont wanna f it up

and internal damge if not rejettin i know it runs lean but

 

i dunno i was thinking same thing with my yfz i just put on my hmf and it runs great n i havent jetted it yet but im sure it will run better with jetting

 

You dont want to be runing too lean. I know you get better power and all but it's pretty risky. I would personally rather jet it to save some real damage