Didn't mean to suggest you did something wrong w/ the mounts, just making a random suggestion on something I heard in a different post : )
Hey Panama, just out of curiousity, did you talk to the Banks folks about your problem? You mentioned that your factory header lasted you 10 years, mine only lasted 2 (bad when I purchased the rig w/ 50K); shows how its all a big crapshoot to some extent. I called Banks directly when I was considering their product, and they were very helpful to me.
The specific corrosion I was referring to was internal, caustic gasses oxidize the interior of the exhaust system (rusts from inside out). I know that the ceramic doesn't completely encase the interior of the header, but it does get in there and help. I'm no engineer (at least not till next Winter when I graduate...), but just my experience, and where I placed my faith and cash. Even if the ceramic doesn't increase longevity, it does cool the engine compartment, and reduces the heat convection and radiation to the aluminum intake just inches above the exhaust.
My experience with the Banks Tubes have been superior in all respects to the factory setup. I'm usually not one to jump on the bandwagon, and I don't recall the grade steel used in my Torque Tubes, but the impressed the H-E-double toothpicks outta me.
