Kooks 1-3/4" x 3" stainless long tube headers for pulley-and-tune GT500s. Broadens the supercharged torque curve and opens the top end where the cast manifolds choke flow — one of the highest-ROI bolt-ons for a built GT500. 304 stainless construction with 3/8" thick laser-cut flanges handles sustained supercharged heat. Oval port, 1-3/4" mandrel-bent primaries.
Fits 2011-2014 Ford Shelby GT500 (5.4L / 5.8L 4V). Requires a Kooks X-pipe or H-pipe to complete the exhaust connection. EGR fitting included for cars retaining factory emissions equipment. Stock bolt pattern bolts directly to the 4V cylinder heads.
Kooks Headers & Exhaust has been hand-building stainless headers and exhaust systems in Statesville, North Carolina since 1962. Every Kooks header is welded by experienced fabricators in the same shop where the company's NASCAR and drag racing roots were established. 304 stainless construction handles supercharged heat and salt-belt corrosion.
Includes PY-8034-AL gaskets, two (2) CAS-109203 oxygen sensor extensions, and all installation hardware. Pair with a Kooks GT500 X-pipe (PN 11423100) or H-pipe (PN 11423400), plus an appropriate cat-back downstream.
