Freedom Performance Exhaust Racing Dual Exhaust with 4" Mufflers, Black with Black Tips MK00010 The world&rsquo;s only 5-step 4&rdquo; performance system, triple stepped headers for anti-reversion, full range torque and optimal horsepower 2&frac12;&rdquo; to 3&rdquo; stepped louvered, power thrust baffles 4&frac12;&rdquo; muffler with 2&frac12;&rdquo; O.D. full-length, 1-piece 220&ordm; heavy duty 16 gauge heat shields O2 ports &amp; plugs provided Complete with mounting hardware and brackets