I have 2 sets of Mercury dryjoint exhaust for sale $500/pair. Small block Chevy 350 5.7L and more (as long as it is a small block Chevy) 2 different riser sizes (will update) These are used and in need of disassembly, clean up and reseal. They were replaced on principle for the customers and are in goid shape. These are an awesome alternative to conventional exhaust manifolds and risers as they have an exceptionaly long life span and they are designed not to leak internally into the cylinders.