I had the Momentum GT on my Nautilus (2.7) and that had a claimed gain of 24 HP.
You're probably right. The "science" behind CAIs has always been questionable at best. I've been playing with engines for a long time, including the local NHRA scene with my old old Cuda and Shelby over 50 years back. Thing I've noticed is that realized gains from CAIs are minimal at best. A cold air intake for a street legal vehicle will do very little other than change the engine noise. You’ll see marginal horsepower increases, usually in the unnoticeable 1 - 2 HP realm. They’re more for show than anything in most cases, but they do sound cool. Your turbos and air intake manifold limit how much air can be delivered to the cylinders.
