Exhaust pipe assembly MR1 engine

[K-9bot]

I took my 2004 AR230 for a ride when the boat lost power and started sounding strange. The port engine would not rev over about 4,000 RPM and sounded like a 4 stroke engine chocking or something. Although the main issue turned out to be a gasket in the exhaust system, I kept looking and took apart the entire exhaust just to be sure. When I pulled the exhaust pipe assembly off the block and looked at the pipe side, I found some missing material close to where the pipe meets the engine block. Also noted some "gasket sealant" most likely from a previous repair attempt which was clogging some of the waters paths, I do not think the manufacturer calls for sealant.
Anyway, would you agree that these pipes are done?
I ordered a used set on ebay, but would you reuse this part on your boat?

 

[Dixemon]

I would weld those up and resurface them on a mill. But then again, not everyone has that option. It would be iffy to re-use those in their current condition. It may be difficult to ensure you have a good seal between the mating surfaces. If i had no other options i would probably make a paper gasket and use a good amount of high temp gasket maker sealant.

 

[dgfreeze]

Agree with above. I wouldn’t reuse them as is, I’d either weld up and resurface, or replace with new/good used.

 

[kjr6306]

They probably didnt cause any performance issues in their current state but used ones a cheap on fleabay so may as well change them while they are off.

 

[HawaiiBreeze]

Take to local machine shop, weld and finish or go DIY - clean out the gash with a dremel bit and fix with JB weld, then figure 8 it on a plate of glass with wet sandpaper (I soak the paper with WD-40) and to level the patch job and the other surface area. Verify the placement of the new gasket to make sure all is square then bolt it all back together.