The 4 inch will be fine as long as you have at least 8 inches before a turn before and after the MAF , If you have a 6 inch tube you can get by with 5-6 inches before a bend
The shorter the MAF tube the further away a bend as to be or it has no time to help straighten out the air for a clean pass over the MAF
C-F-M also sells them and there a sponsor on this site , always good to support sponsors when we can and I am sure as good a price or better , ask for william
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