Thats a difficult question... ideally since you are running .4 more liters, you would want headers bigger than those made for a 3.2 or 2.7... but 996 headers do not fit under a Boxster... so just find the biggest you can.... BUT you want to pass emissions... thats a whole other can of worms which would start with does your state check emissions? or do they rely on the OBC? do you want to run your secondary cats? etc etc... that answer can be searched on here...
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