JByrd, I'm not very far from you and suffer the same weather that you do. I've got 12K miles on mine with the Borla and no warping. I do, as StormCat suggests, lift the clamshell after driving whenever possible.
FYI
I think I actually have an updated (newer) aluminum version coming. Stayed tuned. :wink
Are you accepting trades :biggrin
What, of an original, limited edition AZGT masterpiece? They are "an investment". :biggrin
Does that mean they're an "investment cast?"