I bought 15 stainless steel weldable els and 4 feet of straight stainless steel pipe. I am trying to build a merge collector using a chop saw to cut the angles. I need to know what angles to cut the straight pipe to make a merge collector. This will be a 4-1 merger collector. This will be the first and hardest step to make the ramhorn manifold. For some reason everyone seems to keep this on the down low. Even a google search gives me no usable info on how to create these.