This silencer is only 5 months old and was removed from an aircraft imported to the UK from Germany where they are mandatory Gomolzig's exchaust system product is called Quietflight. These systems offer substantial noise reductions compared to the original system on your aircraft. Very popular with flying clubs, glider towing and Skydiving operations. These are the advantages: Reduced noise (typically 2-4 dBa) from the aircraft. Combined with another propeller (for example with 3 instead of 2 blades), the reduction can be even greater. Equal engine performance, absolutely no power or performance loss. Low maintenance requirements. Very high quality systems, using high grade materials and workmanship