Erik Pancakes said:

What size was the original file you downloaded? What size is it now, with just the 5.1 audio? And is it the DTS-HD audio, or the Dolby Digital (AC3)?

The original size was around 4.4gb, and it is now 2.6gb. The remuxing process took only a few seconds or so, and I removed 8 of the 9 tracks in that process. The 5.1 is AC3. Everything seems to be running smoothly, but I haven't sat down and watched the entire remuxed movie to notice any issues with syncing and such.