Headers.
http://www.summitracing.com/parts/hed-79036/overview/year/1989/make/dodge/model/b250
These may be a good choice, I don't know this particular product personally but I do like ceramic-coated headers, they do a great job of reducing the heat in the engine bay.
http://www.summitracing.com/parts/hed-79036/overview/year/1989/make/dodge/model/b250
These may be a good choice, I don't know this particular product personally but I do like ceramic-coated headers, they do a great job of reducing the heat in the engine bay.