Ford Shelby GT500 Exhaust Test Header Exhaust Comparison
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Here's a comparative look at the Kooks header (top) and the factory's restrictive cast-iron exhaust manifold. The 304-grade, stainless-steel headers feature primaries measuring 1 3/4x3-inch and Kooks' patented Velocity Spike merge collector. Kooks also offers the headers with 1 7/8x3-inch primaries, for Shelbys that make more than 700 hp. View Related Article
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