I DLed & listened to the second set.
I don't think the static & other "bad" audio can be removed from those .wav files.
IMO MFAudio is not ripping the audio correctly . Maybe it is the wrong software for this.
I don't know what the best software for this would be as I usually don't work with games. I just went with the software you have already used & what someone on the video.help forum used.
There is a moderator Terramex on the forum here that has posted quite a bit about copying games . Maybe he hasn't been on the forum & seen this thread. You might PM him & ask if he knows a good program to rip the audio from Burnout 3 .
I would probably use a screen capture software if I was trying to get better audio & then extract the audio from that. But as I said I usually don't work with games . I have used my screen capture software with other type videos & the audio sounded OK.