I just got my X a few days ago and I have been exploring options about improving fuel economy. I have been thinking about getting a drop in K&N, or even the FIPK. Have there been any concrete test results that show a gain in fuel economy with either option. Even some experiences would be nice. I would, of course, also like to increase power as well. Are there any dyno results out that show some concrete gains?

Also my X is still under warranty would either of these two options void said warranty?

Any help that could be given would be great. Any experiences would be appreciated as well.

Thanks guys.