I have my Grom. Its only got about twenty five miles on it but it must have a pipe on it soon. The Grom is way too quiet. At about 50mph all you hear is wind. Several times I felt way invisible on the road and with out 165 RWHP to motivate me I have decided that I need to make it louder. I have a Tanaka Trading co pipe for a monkey from webike, its low mount and looks like it will work without much modification. I'll do the air box mod at the same time. That's step one, step two will be white bodywork and the projector lamp. Step three power pures. Step four suspension.