I have discovered to ways to increase HP in your engine. The tornado and the spiral max are specially designed turbines that fit into your stock intake tube to create more airflow into your engine.
Tornado claims up to 24% better gas mileage and up to 15 extra horses.
Spiral Max claims to give you up to 31% better gas mileage and 35 extra horses. According to customers however hp increase range from 7-31 hp.
Both are similar in design and both have 30day satisfaction and a lifetime warranty.
spiral max is $59.95 if you order from thier website... 69.95 (both plus s&h) if you purchase over the phone.
Spiral Max Tornado is a more familiar name but is approx. $69.98 (+ s&h = $8.95).
Tornado Air Has anyone used these systems on their zetec? Is it worth the money?