Fastway - Ultra Silent Turn-Down Endcap InsertFastway Ultra Silent Turn Down End Cap Insert reduces sound levels with a reduction range of 4 6 decibels. Insert fits all new style, color anodized cone type Fastway Spark Arrestor End Caps. Decibel levels will vary depending on model, tuning, and exhaust system condition. Requires Fastway Spark Arrestor End Cap Will not work on dual exhaust Hondas or two stroke KTM models