I have the DT, and I am extremely unhappy with the issue of surface rust, and I not talking about just the rust on the tubes only but overall everywhere, including the flange area. I would think that seeing that the rust has been an issue since the initial launch of them, that something would have been done to correct that issue, but it hasn't. Believe me, if I had the time and money to purchase another set of headers, I would look else where, including buying the rare nismo's, which are some serious coin. I know I am not the only here that has had problem with these headers for the Titan/Armada from 2004-2010, even some people on the Toyota FJ forums had a serious rusting issue with them, granted you guys took care of the individual, but you have not addressed the issue of rust at the flanges, and the surface rust. I am not expecting for a header to be rust proof, but to show it after just a few months after install, and I do mean 3-4 months after install is unacceptable. I as a provider of mechanical service, have yet to have a vehicle come back for the same issue, granted, I may go time to time without steady drive in customers, but I believe in quality or quantity, which causes customer to keeping come back and have new ones come in for the service due to being recommended by existing customers.