Restrictor Flange f. header pipe Derbi \/ Gilera \/ Aprilia

Restrictor Flange f. header pipe Derbi \/ Gilera \/ Aprilia. This is usually part of the OEM settings and is in many cases removed so the carburetor can get more air and perform better. In case you want to \/ have to go back to the OEM settings – here is a restrictor flange for the header \/ downpipe (Derbi \/ Gilera \/ Aprilia).