Selling 1 set of cmi big tube strait back, 2 1/4 primarys , vgc no scratches or dents, i have water rails, and new link to connect rails to headers, 60 psi test has been done on headers, these r custom order headers from cmi, they were off of a 43 nortec, i had both sets and sold 1 set to a guy over on performance boats for his 21 daytona, the measurements r 27 1/4 center to center of collecter, and 16.5 from rear manifold bolt to center of collecter, these headers from cmi cost 11.260 a set , 4000.00 obo plus shipping 434 284 0485