I see they have a couple of types of 4" exhaust hose , a soft and a hard wall type. I need to run about 16" of this hose and not sure which type to use . Thanks Jeff

Series 200... sold at westmarine.

There's softwall, hardwall, and corrigated. Corrigated has a wire wrap so it will accept slight bends without kinking. The hardwall is really only good for real straight shots, it's pretty difficult to work with. The softwall hose is what's used most common. It's easy to work with, and it will accpet slight bends. The application will determine which hose is appropriate for you.

I bought some hard wall stuff at a local industrial hode and fittig store last year. WAY cheaper than West Marine. I don't have any bends so was easy choice to go with the hard wall stuff.