Freedom Performance slip-ons deliver the perfect sound and performance for Dressers. With exceptional engineering, superior manufacturing, stylish finishes and end tips, you will get the best in quality and performance that your money can buy. No matter which slip-ons you choose, youll get increased power and a unique crisp throttle response. For the best power match up available, take a look at the Freedom standard true duals, sold separately. Not legal for use in California on pollution controlled vehicles -. Check local laws before installing.