i think you tune your guitar down 2 1/2 whole steps, or put a low B string on in place of the E string and move all the strings down one spot (B, E, A, D, G, B) but im not sure

this is the begining of the song aswell as the chorus
E-4-4-4-3-4-3-3-3-2
B-4-4-4-3-4-3-3-3-2
then you play it palm muted with the high string part,  but i dont know that part yet, when i figure it out, ill post the tabs