Intake air tube size?

4" tube on my 6.1. Spectre Performance 97991


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Where do you get your air from??
I was thinkin of makin a 4" hole where the small hole is for turn signal, then seal the box lid, so its like ram air....maybe a coupple removable luvers to keep rain off the filter with a small drain hole in corner of air box..
Is this simmilar to your setup?