Intro: (This part sounds like a chainsaw but it is only wicked overdrive)
E|---------------------|
B|---------------------|
G|---------------------|
D|--3--4--3--4-6-------| (Listen to the song for
A|--3--4--3--4-6-------| how many times to play.)
E|--3--4--3--4-6-------|
Guitar 2: (I am not sure, but it could be the bass, if it's the bass just use one string)
E|-------------------------|
B|-------------------------|
G|-------------------------|
D|-0--1--0--1--------------|
A|-0--1--0--1--------------|
E|-0--1--0--1--------------|

Pre-Verse:
E|---------------------|
B|---------------------|
G|---------------------|
D|---------------------| (Once again, Listen to the
A|---------------------| song for how many times to play
E|-1-3/5^-0-0----------| the riff.)

Verse: (Almost same as Pre-Verse but in heavy chords)
E|---------------------|
B|---------------------|
G|---------------------|
D|--1--3-5-5---0-0-----| (Just Listen)
A|--1--3-5-5---0-0-----|
E|--1--3-5-5---0-0-----|
              * *

Pre-Chorus:  (Very Short)
E|---------------------------------------------|
B|---------------------------------------------|
G|---------------------------------------------|
D|--3----------------------------------6-------| (If you listen, you
A|--3--(<--(| Repeat like 4x, then)-->)--6--(2x)-|   will get it)
E|--3----------------------------------6-------|

Chorus:
E|------------------------------|
B|------------------------------|
G|------------------------------|
D|--0--6--3--6--0--6--3--6------| (Listen Carefully)
A|--0--6--3--6--0--6--3--6------|
E|--0--6--3--6--0--6--3--6------|
      ^           ^
E|-----------|
       Not sure about the 6th fret,
       It may be the 8th.