Boost Block Manifold a.k.a. boost bottle/juice box. (For e-ton 40 scooters only) Billet aluminum boost block manifold Improves throttle response, acceleration, with better fuel burn and power and overall performance. Can increase top speed by as much as 2mph. Reduces intake noise. Works best with HP carb. Minor modification to plastic engine cover. Bolts and gaskets included for use with included intake manifold to boost block adaptor. with new improved thicker spacer the modification to cylinder head Heat fins is no longer needed. �Watch our installation video on youtube