Kooks Headers 1-5/8in x 1-3/4in Torque Series Shorty Headers

Headers replace the cast-iron exhaust manifolds with tubular pipes. These are Kooks' shorty headers, which bolt back to the factory Y-pipe, built with stepped primaries that start at 1-5/8 inch and open up to 1-3/4 inch.

why this one — This costs nearly three times BBK's shorty for the same install job, so you are paying for Kooks' construction and its stepped Torque Series design, which Kooks says is built for power across the RPM band rather than just up top. No horsepower number is published. Worth knowing: Kooks' own fitment text names the Silverado and not the Sierra, though a verified review on their page is from a 2026 Sierra AT4 owner.