VRSF E9X M3 S65 Test PipesUnleash the sound of your S65 V8 while adding performance with a set of VRSF Test Pipes for your E9x M3! With not enough performance mods available for the E9X M3, we offer the catless test pipes. Removing restriction will automatically increase performance gains on any car. By removing the catalytic converter, you will have increase airflow through the exhaust. This will also increase sound and a little smell. By running catless you may find gains