My newest friend, who happens to have a KB hemi powered Cuda with a Lenco, was at the local car show this weekend and picked up some stainless tubing for me to make up my headers. Top and bottom rows are 2 1/4", middle row is 2 3/8". All stainless 20ga. from Pro Fab. Each row was boxed up and priced at $40/box. Should be a real good start to the new headers.