[Muted-------------------------------------------------------------|
e|-----------------------------------------------------------------|
B|-----------------------------------------------------------------|
G|-12-12-12-12-12-12-12-12-(b9)(b9)(b9)(b9)(b9)(b9)(b9)(b9)11-11-11-11-11-11-11-11-|
D|-0--0--0--0--0--0--0--0--0-0-0-0-0-0-0-0-0--0--0--0--0--0--0--0--|
A|-----------------------------------------------------------------|
E|-----------------------------------------------------------------|

This part of the riff is followed by:

[Muted--------------|
G|-7-7-7-7-7-7-7-7--|
D|-0-0-0-0-0-0-0-0--|

However, during this part of the riff, you can experiment with not muting the strings, 
and doing several different noodly things on the G
1.
G|-7-7-7-(b9)7-(b9)7-(b9)7-

2.
G|-7-7-7-(b9)7-(b9)11-(b9)7-

This goes on for quite a few bars.
Once the vocals come in ("I can barely hear you breathing") you'll want to be 
doing variation 2 unmuted.

In the "There's something wrong" yelling part these chords are played:

e|-15-15-15-15-15-15-15-15-12-12-12-12-12-12-12-12-14-14-14-14-14-14-14-14-10-10-10-10-10-10-10-10-|
B|-------------------------------------------------------------------------------------------------|
G|-12-12-12-12-12-12-12-12-(b9)-(b9)-(b9)-(b9)-(b9)-(b9)-(b9)-(b9)-11-11-11-11-11-11-11-11-7--7--7--7--7--7--7--7--|
D|-------------------------------------------------------------------------------------------------|
A|-------------------------------------------------------------------------------------------------|
E|-------------------------------------------------------------------------------------------------|
(x2 I think)

"THERE'S SOMETHING...!"

e|-1515151515151515-1212121212121212-1414141414141414-1010101010101010-|
B|-1515151515151515-1212121212121212-1414141414141414-1010101010101010-|
(this is 15, 12, 14, 10, but played really fast, almost tremelo, and played 4 times)

"With my tooooooaaaaaassssttttttttt"

e|-15--15--15--15--12--12--12--12--14--14--14--14--10--10--10--10---|
B|---15--15--15--15--12--12--12--12--14--14--14--14--10--10--10--10-|

Basically do that to the end. A fun section of the song, but as I say, go crazy with the first half.