Yes it even looks like cast iron piping is making a come back in the housing market http://www.housingzone.com/topics/cisp/cmaterials/cisp01da001.asp

"Many builders and homeowners have become aware of the noise problems associated with plastic piping systems. Due to these noise problems cast iron is now specified because of it's superior sound suppression. This time proven material is again today's choice for custom residences "

I'd be curious to know what the adder was.