You can get better gas mileage, as long as it is done rite. I did my intake, but I also added 35" tires, so I could not really tell. On my Subaru, I gained 5mpg better with just the intake alone. The response is way better. The key is not suck in all the warm air. Having less restriction defiantly helps, but the more fresh air, and the cooler it is, the more it helps(at least to my understanding)
I like the way the intake sounds too. Sounds kinda mean. lol
The kit I did, must have had a longer pipe. My filter is right at my fender wall, lined up with hole for the old intake. I took my fender off and ran a section of PVC facing towards the driver door and connected to the center of the cone filter.(then put my fender back on, so it is all hidden) to get as much outside air as I could