I bought a banks piping kit on here but the couplings dont fit right on my early 7.3l intercooler with aluminum end tanks. It looks like the coupler needs to be 3 1/4 on one end and 3 on the other. I took the pipes up to a shop and they had 3 inch and 3.5 inch the three inch fit on the banks pipes but the 3.5 inch was slightly too larger for the intercooler. Anywho what i am getting at is I need the couplers. What do you guys have?