Dear Luis;
The "cold air effect" or Ram Induction only aids the higher horsepower engines and only then at high speeds as Mike explained.
I remember when that 'fad' started in the mid 60s & it was just that. The 'muscle car' kids just had a new gadget to show off.
I used to rib them about having a "rock catcher" on their hood. Otherwise they (hood scoops) did look kinda cool @ the time.
Happy trails.
