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4” Exhaust Material

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LuckyDog33

New member
I’m in the process of removing heads on my crusader 454 due to 1 stuck intake valve. When I removed the exhaust system from the riser/elbow, consisting of a combination of 4” marine wet exhaust hose, cast iron 90s, and a cast iron tee. I’m sure it will be fine, but if I’m doing the work, I want to replace with all new. MY question is should I go back with fiberglass instead of cast iron? My last boat had 5.7mpi’s and had fiberglass, not cast iron. What are the pros and cons of each? Thanks in advance!
 
My 1996 390 Express has fiberglass 90's, they work great. I had to reef on them pretty hard to get them off, and never even heard the fiberglass make a crunching or collapsing sound. They're pretty sturdy. If you ever want to take this thing apart again, do yourself a favor and add a thin film of marine grease on the rubber 4" hose.
 
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