Not sure what the limit is of the apexi, I think the limit is more likley to be the induction hose then the filter.
I have seen the Apexi work well on both a 2.5 and 2.0.
On Duekboys 2.0 and 18G it flows the highest of all filters I have witnessed.
It defo flows well on mine an Injector (IDC) went from 94 to over 100%, so had to wind the fuel pressure up 0.2bar to cope.
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