make sure you have some socket swivels.......you will need them to remove and install the h-pipe.......put a small amount of antiseize on the the O2 sensor threads.... it will make it easier to remove the O2's if you ever have to........if the h-pipe didnt come with a gasket for the passenger side, you will need one,unless you want it to leak....the easiest way to intall the H-pipe is to first install the gasket on the passenger side then install the front of the h-pipe ( BUT DONT TIGHTEN,LEAVE IT LOOSE) then install the rear of it (BUT DONT TIGHTEN ,LEAVE IT LOOSE ALSO) then tighten the front left and right side until its snug...... then tighten them a little at a time until its tight then tighten the rear of the h-pipe and if you follow these steps you wont have any leaks.......Good Luck