Instructions were very easy to follow, however it took me more time than advertised. There was a screw behind the bumper...quality of product has declined a bit, it's the little details that matter. I have ordered products from AEM before and noticed the AEM logo is no longer painted on the product, but now is just a sticker. The rubber part used to connect the intake to the throttle body used to have the AEM logo on, now is just some generic piece of rubber. One of the breathing hoses was too short so I had to contact them and ask for a replacement. These are the main reasons why I don't give them 5 stars. I pay top dollar for your product, I expect nothing less. Over all the fitting and sound are great, performance has improved and also noticed better gas mileage once installed.