Hello, I know that the current headers will fit the F22c motor. Most of those header where design for the F20c motor which lack low end torque and was design to give best horsepower on the midrange. Since the F22c is tuned different than the F20c and the powerband is a bit different what header will work best for this motor.

 

Moving to S2000 Talk as per:
https://www.s2ki.com/forums/index.php?showtopic=247214

 

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Well, from what i saw here at s2ki, the new J's racing header is the one to get.