Our new silencer systems are a further development of the Russell Church designs that were tested on a dynamometer operating a Sachs 200 AZL-R to ensure that optimum performance was achieved with good silencing properties. Use of the correct diameter pipe with an expansion chamber located just before the silencer were proven to increase power output. Some owners may not be seeking more power but engine flexibility, improved hill climbing, less gear changes, and improved fuel consumption are significant benefits. Shipping cost is just £35 (Europe) or £67 USA or you can collect at any event we attend. There are 3 pages of technical notes (see images) explaining the development and advantages of these units.