stainless steel risers on a Yanmar 440

[Promises]

I have a 2004 Formula 40PC with 2 Yanmar's 440 with around 600h.
just saw some rust pinholes in my large exhaust pipes, do I need to replace the risers too?
tks

 

[Promises]

I had pin holes too, after 14Years, my mechanic told me I should replace the risers too, which I did.

 

[Sooliman]

I had a couple of pinholes on mine as well, had them removed, and welded and they’re perfect. Don’t just replace for the heck of replacing - make sure a qualified expert analyzes them first (it’s very expensive!). The welds, again done by a pro, cost me $100. The risers may or may not need to be replaced, again don’t just replace a very expensive part and pay the associated labor without them being closely evaluation when the stainless pipes are off.