Keeping the air speed up on the intake side of the air filter boosts torque a bit at middle revs by preventing flow reversals as pressure pulses bounce back and forth in the induction system as valves open and close. But the less restriction there is the higher the peak power will be. Also the less restriction there is the noisier the intake system will be.
That's why Renault fitted the air cleaner with two intakes. One that's always open, and the other that only opens at high revs and throttle. That gives the best of all worlds. Torquey, powerful and quiet. If you replace the standard system with a Viper you'll lose a bit of mid range torque and gain a bit of top end horsepower. If you add a second intake to the Viper the effect is going to be further in those directions, but its probably going to be so small it would be hard to detect.
But you want to do something as well, and that's to put the air intake(s) where they'll provide a ram-air effect. In that case the ram effect will increase as speed goes up, but even with two intakes its only going to become noticeable at fairly high speeds. If you look at bikes you'll find ones with ram air add a maximum of about 10% in power. At 300 km/h. So at about 100 km/h you might get 3%?
I looked into what you are talking about because out here we have the desert lake racers association. They go out onto a dry salt lake in the outback and run maximum speed tests across a number of measured miles. Legally. And they allow ram intakes as long as you don't remove any necessary equipment or cut holes in body panels or block the grille. Which left the obvious possibility of taking out the fog lights and turning them into ram air intakes. It would have added a few km/h to the top speed. But their rules, which are derived from US hot rodders rules from back in the last century, don't take into account how fast even standard cars are these days and they assume anything capable of more than 210 km/h must be highly modified and they require roll cages and racing suits. Gees, I've done more than that on the highways.
