[proud_924s_owner]

it dosent change the way the exaust note sounds but it allows intake manifold pulses to sound out through the filter. its an interesting sound and if you would like to hear it jsut remove the upper half of the airbox as if oyu were to change the filter but keep the filter in there, start the motor and give the throttle cam a few twists and see if you like the sound or not. however i cant reccomend getting the aftermarket conical filter for any performance reason. it will only take in the very hot air from the motor compartment, and hot air being less dense then cold will naturally restrict power. really the only way to increase power in the 944/924s 2.5 liter motor is to convert to a mass-air setup and get rid of the tiny inlet bosch air meter. not only does this give you nearly infinet tuning possibilitys, but it opens up the intake tract from a 1 inch by 2 1/2 inch (approximatly) opening to a 65 MM and up round opening. increases in airflow are well above 150%. to get more power out of the stock airbox you can take a piece of 3 inch tubing and run it from behind the front bumper to the inlet tube of the airbox on the fender. i used a short piece of vinyl dryer vent hose as it is realitivly strong and meant for moving large volumes of air. having it exposed by moving the bumper as far right as possible will creat a ram air effect at speed and force more air through the meter creating more power.