STILLEN's Exhaust Systems are built for power. Power that you can feel across the power band with a big gain on top. Mileage gains during highway travel can be expected as you cruise at steady speeds. The free flowing performance Mufflers themselves are aluminized or stainless steel for long life. This fit and finish are second to none. The improved airflow created by addition of the exhaust is verified by the significant dyno HP increase. Adding the STILLEN Exhaust to your vehicle is a must. Actual product may vary slightly from image.