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- Kooksâ all new 2007 Shelby GT500 Headers and Complete Exhaust System are now available. The Complete System is made with 304 stainless steel. The 1 3/4â x 3â Headers are interchangeable with the stock exhaust. The Kooks x-pipe is 3 inch and drops to 2.5 inch to attach to the rest of the Mustang GT500 exhaust kit. The Headers and Complete Exhaust System are available in catted X-Pipe and off road X-Pipe versions. 02 Sensor Extensions are necessary for proper installation and are included with the Headers. Carb Legal in 49 States.
- Dyno Results: An average of 25-30 hp gains and 24-32 lbs. of torque gains.
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