I've got Pinasco / Malossi expansion chamber for a ET2 Vespa Scooter, Gilera, and a bunch of Piaggio New in the box! MHR part number M329834 retails $438.91 same pipe sold under P10561125 Pinasco for $299 Your basic 50-68cc power pipe with 180 curled end to confine the silencer for space.
http://www.sip-scootershop.com/en/products/racing+exhaust+malossi+mhr+_m329834
Bought for another project that will not happen. Would work great on Yarf dog or other small 2st go-karts or Moped army....
$200 still in the box
44Dwarf
