The heat exchanger has not been off since I've been around the car. The puts them at 13 years. The exchangers are a little rusty looking, but solid. You can see how oily the left one is from this photo. And that photo was taken after the car had sat for at least a year...
http://eludicate.com/~bolen/911E/photos/photo.php?photo=./20030622-183305/DSCN4509.JPG&return=%2F%7Ebolen%2F911E%2Fphotos%2F
I'm leaning towards letting him tackle this, I want to work on the car, but I want to drive it too!
thanks for the info,
britt