Using this DC Sports intake kit is easy. First, gather all the parts included in the kit as it comes with all the necessary hardware. You don't need to cut or modify anything during the installation process. Just follow the included instructions to replace the old, restrictive OEM rubber intake pipe with the smooth mandrel - bent aluminum tubing and attach the high - flow air filter. When it comes to maintenance, check the air filter regularly. If it looks dirty, clean or replace it as needed to keep the intake system working at its best. As for usage, you can enjoy the improved performance and throttle response knowing that this kit meets emissions standards all over the USA. But remember, the CARB compliance only applies to the 2007 - 2008 G35 models.