Vespa Proma Circuit Exhaust v1k Pop this in the rear

Pop this in the rear pulley of your Derbi moped

The screws holding the reeds in place are just a tad too large to fit into the cylinder

Comes with a brand new replacement piston made in Italy and an intake designed for Dellorto SHA carburetors

The variator features proper roller weights as opposed to the more common ball design

Not as nice as the other set but still pretty nice

Vespa Proma Circuit Exhaust v1k Pop this in the rearProma Circuit exhaust for Vespa Piaggio Ciao, Bravo, Si, Grande, etc plus Kinetic TFR. One of the best exhausts for Vespa mopeds. These fit great with little to no complications and give an excellent boost in power.