I need this device

This is the business.

http://www.turbospoke.com/Default.aspx

Why would you want your bicycle to sound like motorbike ?

I think Hope 2 hubs have a nicer sound :D

Why not try a piece card held in place by a peg sticking in to your wheel?
same effect?
much simpler and no waiting for the post man to bring the parcel or need to go to local bike shop?

Terry

beats a peg and a bit of hard plastic !

Deadly i would love that ,brings me back to my childhood days.