I just installed an Injen cold air intake for my truck. Very easy to install open top but draws from the fender well. The difference in sound from stock to this is night and day when you get on it but it's not abnoxious. Dry filter no oiling and when I read their dyno test they had the highest gains I've seen and if you look closely it's around 90 degrees when they did the dyno. I have not dynoed it but I notice a huge difference in acceleration and response. Best part it was on sale for $240.