refresh my memory again on where you measure from and too for the correct header length. If memory serves me right Mine is just under 12 inches from where the header bolts on to the engine to the joint. I'll have to re- measure and confirm that. The opening in the fuse where the pipe comes out is pretty tight. I think I could go shorter but would have to cut the headers and to go longer I would have to cut new holes in the fuse.