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Actually I was just talking to Mike that owns Roto-Fab a few days ago and that discussion came up. You are better off with the 4" unless you are at least 700 rwhp. That's from his mouth and he should know since he designed both of them. You just aren't moving enough air at your boost level and HP level to make it worth the extra money. I made well over 700 rwhp with my 2300 Maggie and a 4" Roto-Fab. Now that said results may very.
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