I have a couple sets of 1.7/1.8 heat exchangers that have been semi-refurbished. That's to say - they've been cleaned and coated in VHT header paint (1300-2000 degree). They have the typical dents, dings and un-sealed edges at the heater boxes (from age, rust), that you normally get with used mild steel heat exchangers (these are not SSI). TONS of life left in them tho. $150 shipped each set.
