This new version of Doppler's intake chamber, which has been on the market for already a while now, comes in a new design that improves the way the boost bottle works. A boost-bottle is positioned between carb and reed valve, where it stores the mixture when the reed closes, thus preventing the mixture from being lead back to the carb again. This way the mixture doesn't become too rich; the result is better fuel economy coupled with improved throttle response. This special boost-bottle version is equipped with a bigger chamber compartment and a knob that lets you continuously adjust capacity. Available in six different colours; hoses and everything else necessary for installation is provided. Size: 6 x 22 cm.