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I cannot save the boosted files as mp3!!!
I use MP3Gain.
It's free, fast, simple and you can 'batch run' several MP3s at once.
Install MP3Gain, drag the MP3 files that you want to change into it, have it do a Track Analysis on all of them, and then have it do a Track Gain (to the dB level that you want) on all the files.
Simple and sweet.