K&N REPLACEMENT AIR FILTER TO SUIT HOLDEN A16XHT A20NFT B16SHL B16SHT TURBO 1.6L 2.0L I4This K&N replacement air filter is designed to increase the horsepower and 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 Holden vehicles fitted with the Z20S1, Z20D1,