K&N REPLACEMENT AIR FILTER TO SUIT HSV SV300 VX LS1 5.7L V8This K&N replacement air filter is designed to increase the horsepower and the acceleration while providing excellent filtration. It is washable and reusable, and is custom designed to fit into your existing factory air box. Its drop in design means adding performance is simple. With most vehicles you simply have to remove the disposable air filter and replace it with a K&N air filter. This air filter suits HSV vehicles fitted with the 304 Stroker,