I have an OE front pipe from the exhaust manifold back past the transmission cross member that I am keeping as a pattern. Problem is no one makes or has the bending dies for 1 1/4 inch exhaust. OE part # is 20010-08700 on page 51 of the parts manual.
I can't even find an engine shop that make customs headers who is willing to help.
Let me know if you would like one made from 1 1/2 inch exhaust. Its close, but a little tricky tightening up the 1 1/2 pipe on the manifold without it leaking.