[WardL]

David, I have the standard SPF exhaust headers and heard they are what is best, but I question that statement. Are there any basics or calculations to determine the optimum design? When you were bending tubes, were you bending them to fit or did you have some particular calculated design in mind? I what other criteria can you design for besides diameter and length? I'm assuming one goal is to have the same length tube out of each port? I'm not going into the design business, but would like to know what is "best" for my engine. Any comments would be very interesting. Thx!