Re: Home made exhaust riser - mixing elbow
The Universal 5411 on my previous boat came with an exhaust loop made out of standard pipe fittings. When it came time for replacement, a trip to Home Depot resulted in all the black iron pieces (elbows, nipples, tee, etc) needed. Total cost about $30.
I replaced the U-type exhaust elbow on my current Yanmar 3GM30F this spring. Cost from the local dealer was about $150. Not terrible. If that's what's on your engine, that's how I would go.