I had to replace the exhaust riser on one engine ,MD 2010/20 last year,
and expect the other to go soon ! the Volvo type is a poor iron casting , has anyone found a stainless elbow to replace it with ? could an aluminium one be used , like the aftermarket Perkins type?
Yes you will be able to find one. I was going down the same track with an MD2030, but I was advised that stainless and cast iron aren't too friendly as dissimilar metals. Just something to think about.