Adding this silencer tip to the Treal Performance exhaust can drastically reduces the sound level. On our KOH Exhaust for the X3 we tested it with a DB meter and at 3k RPM it went from 95db to 88.5db. That is 6.5db quieter!
This silencer Insert is only intended to work with our Treal Performance Exhaust System but can possible work with other exhaust that are 3 inch diameter