Thousands of hours were spent in our wind tunnel testing and retesting refinements to improve aerodynamics, dramatically reduce conversation-robbing NVH (noise, vibration, and harshness), and help improve fuel efficiency. All V8 and 3.0L Diesel equipped vehicles feature dual 8.9 cm chrome tips for the all-new dual exhaust system. Look underneath and you’ll find the under floor muffler and dual resonators are tuned for quiet operation, but come alive with a full-throated, bold sound when the pedal hits the metal.