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When installing certain performance mods it may take some time before the CEL will pop up so you can work on it. Here's a link that will show you how to drive your car to make the CEL come on as soon as possible. Following these steps will make all monitors in the car run therefore if anything is wrong it will pop up.
http://www.obdii.com/drivecycleford.html
http://www.obdii.com/drivecycleford.html