without a supercharger or turbocharger forcing extra air under pressure into the engine increasing the air flow capacity to the engine will do nothing at all. The vac butterfly is for warm air on cold start and works well without causing enough of a restriction to worry about with any non supercharged engine anyway. this whole CAI business is an aftermarket accessory rip off using dubious science and dodgy claims Are you sure this is just for warm air? I have worked on a couple of V6's in the past, and discovered on one of them in particular, it has a total of 3 butterfly valves in the intake. One for the main throttle, and another 2 at different places in the intake which open at different RPM points. The idea was called "VLIRS" I think it was, meaning Variable Length Intake Resonance System, which relied on intake air resonance to improve torque at certain points... and this was on a 1.8L V6 (Mazda Eunos 30x). If you accelerated hard, at about 4000 RPM there would be a sudden huge boost in performance, where it would then fly up to about 6000 RPM, where it would open the second valve, which would then give another huge boost up to 7000 RPM... it was incredible! I wouldn't be entirely surprised if this system exists in the Aurion, as a number of modern V6 engines have this feature. it could work with the aurion but whos got the balls to try it :)