Cowl Exhaust Silencers for diesel engines Exhaust Diameter 1.5'' to 12''. Spiral Design, Compact and Lightweight; Not a Muffler ... A high performance silencer embodying a unique and compact design concept. The answer to your large noise, small space problems. Robert Bosch Diesel Fuel Injection Parts Garrett Turbo II Air Precleaners Eaton Superchargers Products & Services | Specials & Announcements | About Dynamic | Contact Us