Easy to install
This was very easy to install. I also installed a throttle body spacer and upgraded mass air flow sensor with this. The throttle response is much better now. Noticed immediate increases in MPG, which is the reason for getting these products. Will easily pay for itself real soon with the fuel savings. This product is not too loud, you can hear the air whistle in a specific RPM ranges but it is not anything overly annoying. I am very happy with this product.
Injen PF CAI for 2004 Nissan Armada
I've had the new CAI installed on my Nissan 5.6L V8 for a couple of weeks now, and I think it has increased my peak HP by about 10%, based on improved 0-70 acceleration times and maximum Mass Air FLow as measured on my Superships Flashpaq. Two things surprised me, though, and kept me from giving 5 stars all the way: (1) I expected that a CAI would in fact be drawing all the air from outside the engine compartment. That is the way the stock intake was set up, but the Injen draws air from the engine compartment, so it is really NOT a cold air intake. (2) There was only one bolt securing the Power Box to the inside of the compartment. I had to fashion an additional support under the box.