[avan]

A "quote" from another "car forum" from a group at an engineering college

I" can't stress this enough: under *controlled* circumstances with a 350 cid Chev motor producing 180 hp and every engineering student submitting a design. NO measurable hp or fuel economy gains were recorded at under approximately 1 meter. This was using an assortment of aftermarket products as well as the shop designs. It did lead however to massive throttle lag.
A long straight tube on the air side of the carb or TB with no vanes, few bends, no internal sources of turbulence, a cold air source and a large, quality paper element returned the best HP and fuel economy gains without modifying the mechanics of the engine."

PS we have both turbo-charged and super-charged Jeeps in our 4x4 club