there is no "best"
headers are a give and take
1 design will take from one end of the power band and give to the other
another design will do the opposite
the trick is to add to one side and not "take" as much from the other
1st order of business is the flange ---CORRECT header flange
make sure your header flange is NOT covering any of the exhaust port and also make sure that it is not so big that it may lose a seal when put into use
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