Significant noise reduction is what you can expect with these Exhaust Turndowns with Cone Inserts from Dynatech. The turn down is expanded to slip over collector outlet or tailpipe (but welding or bolting is a recommended mounting method). Greater sound reduction can also be achieved by directing the outlet away from meter or sound test point. U-tab mounting hardware is included. The mild steel turn down with cones are made from T304 Stainless Steel. For a full on race sound, low profile turndowns without cone inserts are also available. They are fully open, mandrel bent designed for no reduction in exhaust flow. These turn downs are constructed from 17-gauge mild steel and painted with a high temp black finish.