Bout 1-15 HP sad isn't it? It does give better gas mileage BTW or depend on how you drive your car.
so basically however you install it correctly or not, it range from 1 HP to 15 HP, sometimes it doesnt matter it could range to 0 and waste alot of gas on your car.
A quality made cold air intake system will add around 5 h.p.
5- 10 hp depending what is done to the car
about 100 horse.
between 25-50 horses
you will get an extra 2 or 3 horse.
a cheap way to add a couple horse is to add a later style escort intake to yours, say a 96-99 if the bolt patter is the same
100 horse.
About 5-10 hp depending on MODS
ur cheapest way to increase horse power would be replacing your air filter with a cold air intake. you can also add a perfomance chip to your ecu.
Between 100 and 200 horse.
240-260 horse power stock, supercharged. Buy a smaller pulley for supercharger add 30-60 horse power more.
Headers may add 3-5 hp depending on design and a cold air intake will add around 4-7 hp for a total gain of 7-12 hp untuned. Definitely worth it especially with the nice throaty sound you will get out of it.