I had same problem with rust on my TTI's last year. While I had my motor out for it's rebuild. I sent them out Jet Hot(they have a web site). They do headers for NASCAR and NHRA. Their work was great and cost around $250 with a 2-3 week turn around. another thing I did last winter when I put my car up for winter, was to spray them with WD-40. In the spring I sprayed and wiped them with Simple Green before I fired up the car to remove the WD-40.So far they are holding up great no signs of rust.