As has been mentioned before on this forum, you will also need a new flange that mounts the pipe to the engine
I recently did a wet and dry exhaust replacement on a Yanmar
2GMF and can say you will have a near impossible job to get the exhaust elbow off of the threaded pipe.
A new flange, gasket
, connecting pipe, exhaust elbow, new hose, clamps.
Try a get a parts
diagram of this area. Soak the bolts, threads, nuts with Aero Kroil penetration oil
several times, give them a gentle tap to allow the Kroil to penetrate.
Use a six sided socket. Use proper thread sealant
I previously tried to repair
my elbow leaks
with JB Weld...no luck