Custom cold air intakes are specially designed for each individual make and model of car. This is done so that when you go to have it installed, the only modifications to your engine bay that will be required are the removal of the stock air intake tubing and air box and then replacing them with the parts from the custom air intake kit. These kits can be obtained from a number of sources. You can go down to your local auto parts store and buy one. Or, better yet, you can cut the middle man out and go directly to the website of the company that makes the best, K&N.