Length (body): 500 mm, diameter: 220 x 140 mm, oval, connections: 63.5 mm (inside, slotted also suitable for clamp mounting). Performance specification: up to 350 HP Simons silencers enjoy the reputation of high noise insulation. We have used you on several vehicles with a surprisingly pleasant sound. All silencers are made of stainless steel with stainless steel connectors. Made in Sweden (not a China product). No TÜV identification or similar. Only racing use or special approval according to §21. What does quiet mean? We compared the Simons silencers with dampers from other manufacturers and measured the volume. In all tests, the Simons dampers were the ones with the best noise insulation. The test compares only absorption dampers, i.e. continuous dampers without chambers. Mufflers with chambers are quite quiet, only counterproductive in terms of engine performance. Which damper is best suited? The greater the volume of the damper, the more it dampens. Make the most of the space you have under the vehicle and choose the largest dampers. We have had the experience that oval dampers are quieter than round ones. Rear silencer or middle silencer? As our dampers are completely continuous, they can be used as both front, middle or rear silencers.