Yes inside the air-box , where it houses the air filters , there are all kinds of little plastic ribs. I cut them off and smoothed them out by sanding and Dremel tool. I think every bit helps . I also opened up my grille where the air comes in, it never changed the overall appearance of the grille. Injectors may have helped, I did this all at once, so added them in at the same time.
Adding more air, it made sense to add more fuel. Do our stock injectors do the job? I don't know. The 19 # injectors and the air-box I have, will be for sale for cheap soon. I have SRT injectors coming for my car in preparation for my turbo.
There you have it, hope that answers your questions.