The Race Pros unique black clam shell mounting bracket sets it apart from other mufflers. Mounts the same way as nearly every slip-on muffler from Cobra. Its look gets even better with a thin-line tip thats held in place with seven, 12-point zinc plated bolts. Come with 3-inch cores encased in proprietary Cobra sound tuning materials with specific acoustical dampening and thermal insulation properties. The basso profondo notes are made possible because of class-leading resonance absorption and prevention. The frequency and location of the perforation patterns in the high-flo cores creates significant sound scattering in the mid frequencies, which helps to enhance the low frequency tones. Like all Cobra exhausts, Race Pro slip-on mufflers are made in the U.S..