PRI 2011: Kooks Custom Headers Adds 5.4 and 6.2L Raptor Applications

If you are looking for more horsepower for getting around, or just want to hear that ‘big block’ purr, then you should take a look at Kook’s Custom Headers. Offered in 1-3/4 or 1-7/8ths inch primaries and for the 5.4 and 6.2-liter engines, Kooks boasts up to a 40 horsepower gain to the rear wheels.