Available exclusively at DDM. Updated "Shorty" style places the reed block closer to the cylinder, for even better performance! Includes custom engraved billet reed block with case pulse tap, carbon fiber reed petals, and all mounting hardware and gaskets. Installation requires tapping a 10/32 hole into the bottom of the carburetor or crankcase for the pulse line. Significantly improves power throughout the RPM range. Requires intake porting for proper performance - instructions are included. Fits Zenoah G23LH / G230RC / G260RC / G231PUM / G260PUM / G260PU / G260PUH engines. Also fits Chung Yang CY23RC / CY26RC / CY27RC / CY29RC / GP290 engines. Works with Walbro WA / WT series carburetors.