K&N Intake Kit Observations:
Noticeably more power off the line.
Noticeably louder since adding the intake(The guys I work with like the sound a lot). Keep in mind that I have only heard it in "concert" with the Magnaflow exhaust system.
Installation:
K&N installed and tested it for me at their engineering facility, so I can't comment on the level of difficulty of the installation but here's a link...
http://www.kandn.com/instructions/63-1095.pdf
Part link:
http://www.knfilters.com/search/prod...x?Prod=63-1095
I have not measured fuel efficiency/gas mileage yet. Keep posted.