alot of 1gs will do it with a full exhaust, just depends on the muffler. miine never have, but my conquest did with a thermal. but yes, a open exhaust will do it, downpipe or ran out the back.
__________________
FOR A WOUNDED MAN SHALL SAY TO HIS ASSAILANT
'IF I LIVE, I WILL KILL YOU. IF I DIE, YOU ARE FORGIVEN'
SUCH IS THE RULE OF HONOUR.