I have vertical cylindrical exhaust risers., comprising 2 (vertical) tubes, one 
inside the other.  Exhaust gases enter the inner tube and cooling seawater 
enters the top outside tube, both exit through a 6" pipe to a fiberglass 
expansion chamber.  Both risers  are currently OK but have already had weld 
repairs , so logically their days are numbered.

 

A friend's boat with 3208TI V8 Cats has different risers.  They are inverted 
U's with exhaust gases fed in at the forward end and cooling water injected at 
the apex of the U;  water and gasses exit at the aft of the U.

 

It is likely my risers will need replacing within 6 months... and I would 
really welcome information as to whether I should just replace the existing 
risers ( quite expensive to make ) , or fit the inverted U's which seem much 
simpler/cheaper... can anyone give me advice?

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