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 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.