Looking for marine exhaust system for 454 in great shape, freshwater only.

I have a CMI set. Click on the craigslist link to see pictures and specs. They came off a Formula 40SS from Iowa. They are in good condition with no leaks and are satin finish. They can be fully polished out if you like.

http://fortmyers.craigslist.org/lee/bpo/4950306865.html

Thanks but really looking for an aluminum set of manifolds and ss risers.