ok guys i took my 160 for i ride today with no muffler just out of curiosity, OMFG the sound was f'ing INSANE, i was on it and it sounded like a v8 and no matter how many people discredit me for this is was faster and more aggressive, i now you'll say it isn't but i was there and then my mate rode it and i heard it from the outside, #@$# it was like a storm, im selling it but now it makes me wanna keep it, btw i didnt do this near people so dont give me ****, oh plus there were the occasional pops from the exhaust and when you let go of the throttle it makes this awesome burble noise, today was FUN!!