I have an old “tech” write-up by Chrysler were they studied all the “factory” scoops available up through the early ‘70s. Using wind tunnel studies they coincided that scoops mounted low such as the ’70 Challengers, and Cudas, were ineffective due to their positioning which may be why they never made them functional. The shaker hood scoop while impressive looking also fell into the same category due to its openings being basically in the same location. The exception to the rule seemed to be the AAR Cudas, due to their use of the NASA duct style they used which was more effective in drawing in air. They found the best factory hood scoop ever used on the Challenger was the T/A type. They also mentioned that the 6-pak style used on both the Superbee and Road Runner was like wise effective, because its opening was located above the hood.
The 69 Road Runner “Ram Air” system seemed to make little sense as the air just flowed right over the hood “vents”, but again it looked better than the stock hood. They also studied many of the “racing scoops” and found the Tunnel Ram types to be the most effective, but that the early Super-Stock scoops also performed, mainly due to their opening size and mounting location. The Cowl induction type also draws a lot of air for the low pressure area in front os the windshield, which is why it's used in NASCAR, but Chrysler never offered this type scoop (and it's main user is of course on the Chevy SS models).
But the bottom-line seemed to be that unless the scoop was raised a few inched above the hood…they were not that effective in drawing in air.
I wouldn't expect much in the way of power gains from the Cervini system. Their claims like most are based on "their" studies, not outside sources......A good CAI would be just as effective, or perhaps even better in the long run.