Scalloped Muffler - Black - '11-'17 StrykerIncrease horsepower and torque with a deeper, more aggressive exhaust note. Welded from mild steel then bathed in a four step chrome plating process. 4" muffler body uses a cooling chamber with proprietary technology to prevent blueing. Feature scalloped chromed billet tips. All necessary mounting hardware and instructions included, ensuring problem free installation. Made in the U. S. A..