Whisper Lid Install: Need Help!!

[ArticRider]

Thanks for all your help guys. It's spring break for me now and I finally got around to installing it. Took me only 15 minutes. The hardest part was putting the damn IAT sensor into the rubber grommet. I broke a little piece of the lower plastic off on the IAT, but did not damage the sensor itself, so it's all good. Wondering how much a new IAT sensor would cost(in case I have to slip one back into the stock lid for future warranty work)? Thanks all!

P.S. This should help increase gas mileage right? Should I get a K&N or Holley Filter as well? Anyone know if it will help? The whisper lid is the only mod I have done on an otherwise stock 2001 camaro convertible.