Metallica - Fight Fire with Fire (Loud Bass)

This is my version of "Fight Fire with Fire". I mixed it using Reaper and mastered it using T-Racks CS. This is part of my "Burton of Lightning" project, I'm actually uploading all Burton songs I can find in mogg format, that way I can mix the bass as loud as I want to. How was I able to do that? I had access to the original isolated tracks, so that way I felt free to mix them and find a different perspective.