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As far as a increase... not so sure, but its worth it in my opinion. The sound is the best part in my opinion. I have a alta intake with invidia exhaust and I love it. It's not loud to the extreme, but you can tell its there A better driving experience!
Agreed with the above; with the new sounds, you want to play with the throttle to keep making happy-noises. Once the new wears off, you should see an improvement in MPG.