I just put a breadbox on my f0...and am really impressed. With light green UNI foam sheet trimmed to fit it runs great...120 mains, airscrews 1/2 turn out, all other settings stock except for a properly baffled 4-1, it has perfect part throttle response. It does seem to want a little more choke for longer than the stock airbox, but it is still cold here in Michigan.