The 4th evolution of Shot systems, Shot V4 introduces a different way to fix the silencer to the muffler, reducing vibrations, allowing a faster and less frequent maintenance. Silencer diameter is 70mm, so it’s the same of Shot V3, but some “tricks” allowed a power gain up to 1hp. The bending radius of the linking pipe has been increased to maximize flow rates and thus the torque response at low- and mid-range. The Shot V4 is designed to give its best when used on tuned engines. Use of a new wadding material (Acoustapack®) allows to keep noise under control. Acoustapack® cartridges are available as spares.