I have no scientific data to prove anything one way or another but it jst does not make sense that adding more air filter would harm the performance.
I recognise that with improved air flow including the addition of an extream lid you would want to go back and re tune the engine
I have always included a stub stack as well.
too many credable engine buildes swear by them and I have not experienced any detrimental change in performance going from cheapo filter to K&N and or by adding an Xtream lid.
Hood clearance is another deal al together.
It has always been understood that you want as large a filter as possible.
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