3.5 tenths and 3+ MPH faster through the 1/4 mile. Adds 8-10MPH to top speed and upto 40HP! Filters have the lowest pressure drop in the industry. This allows us to fine tune a car to the driver\'s needs without compromising filtration. Each filter has a different pressure drop and flow property. Each filter will measure differently on a dyno and most customers can feel the difference of each one.