There are 5 10mm bolts holding the lid to the stock air box on, and two philips screws holding the sensors in place. If yoiu remove those bolts, and those two screws the lid will lift right off. I've had mine off for almost a month, and it sounds alot better than stock. I had originally planned on buying some sort of intake but there isn't any real hp gains in doing so, nor will you see a dramitic gain/loss in hp if you remove the airbox lid. I do reccomend getting a K&N drop in filter, it's only 45-50 bucks at autozone or somewhere like that.. hope that helps
