I have found that if you rename(or possibly replace with your own custom sound) /system/sounds/poweron/PowerOn.mp3, it will disable the annoying Metro Startup sound. Now to find out how to replace the MetroPCS boot spalsh screen...
since I recovered my phone and went back to factory stock 2.2, I had to do all this over again.
But now I know much more. This time, rather than just deleting the PowerOn.mp3 file, I replaced it with a 1 second silent audio file named the same. That way, the system doesn't know anything is missing.
download the 1 second version from here and just re-name it and send it to yourself, then place it in the correct folder.
Magic's Place - Minidisc Downloads
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