High Performance CNC Air Intake Manifold with Boost Bottle Insert 100% CNC made with high quality Aluminum. Fits all 66cc and 80cc 2-stroke engine. Inbuilt 3/8-24 thread for boost bottle insert. O-Rings seals and eliminates all the possible leaks which add into the efficiency and also provide higher performance. CNC machined to closely match the intake port on most 2-stroke engine.