I'm going to tell you how to add horsepower and save gas with a Performance Filter System.
You never need to replace the air filter again!
This works with Fords, Lincolns, Mercurys, BMWs, Chevrolets, and most others.
Now the average added HP is 7-12 HP, but you may gain more or less depending on your car or truck.
If you want to do this on the cheap, I recommend Spectre Performance Parts.
If you want to go all the way and pimp your car out, go with K&N parts.
This is my first Instructable, so go easy. :)
I'm not responsible for any damage you do to your car or to yourself.