BLACK DUCK SLIP-ON MUFFLERS FOR MILWAUKEE EIGHT TOURINGBlack Duck Stainless Steel exhausts are designed in Barcelona and made in Spain using state of the art materials and race proven advanced techniques to maximize engine power and efficiency. Mufflers feature permanently mounted dB killers. For track use, these components can still be removed, but doing so requires permanent alterations to the exhaust system. This ensures a deep, throaty sound, but voids the E approval.