Got a cool NEW intake Idea!!!!
You want some kind of tubing that is long and as straight as possible to allow the flowing air to achieve laminar flow. You also want the coolest air possible entering the intake manifold. These two factors will provide the maximum amount of oxygen at atmospheric pressure. More oxygen plus more gas means more power.
Ideally you would want 10 pipe diameters ahead of the MAF and 5 past it to allow the air stream to smooth out and be laminar, losing all swirl & turbulence. For a 75mm MAF this would mean 29.5 inches before the MAF and 14.8 inches after the MAF. Pain's set up is about as close to straight as your going to get. 90 degree bends cause more turbulence than 45 degree bends do.
You also want a funnel on the front to allow smooth entry of the air into the tube. An open tube will cause turbulence at the inlet and down into the tube. A conical filter helps but the air will still swirl & be turbulent inside the filter.
Pain has a very good setup, but that is a lot of modification to do. For most people, just make sure that you have the coolest air possible coming into the intake manifold.
Randy





