Like you, I live in the South as well, and I also installed a 200 series starla exhaust system on my car. I installed it about six months ago. I had heard similar corrosion stories, so I bought a three cans of aluminum exhaust spray paint. I hosed down all the parts with the paint (except the new Bosal catalytic converter). I sprayed on several layers of paint. After the burnt paint smell dissipated, the exhaust system still looks brand new. Six months may be too early to tell if it will curb any corrosion, but it seems to be working for me.

One other thing I did relates to the big-fat rubber band thingies that hold the resonator in place. I was able to put one of the "rubber-band" thingies on, but I gave up in frustration trying to get the other one on. I used a makeshift "doughnut" hanger, and failed. I got a six inch diameter hose clamp - like the kind of hose clamp you'd use on a dryer vent hose (only it was stainless steel). I then cut two pieces of old coolant hose ( the hose that goes from the bottom of the overflow tank to the radiator). I cut two pieces - each piece was about 3 to 4 inches long. I then cut a slice down the center of the length. I then used my screw-driver and opened the clamp as far as I could and stretched the clamp into an oblong shape. I then opened the hoses pieces and slipped them over the hose clamp. One piece of hose toward each end of the oblong. I then turned the hoses so that the split pointed outboard. I then slipped the modified hose clamp over the resonator anchor point on the body undercarriage...and then slipped the other end of the clamp over the anchor point on the resonator itself. I then tweeked the positions of the rubber hoses so that they were each situated snugly into the deep grooves of the anchor points respectively. I then started to turn the tightening screw until the resonator was lifted into it's proper functioning position. It's still holding just fine - and since I used a stainless steel clamp, I expect it'll continue to be fine until the government makes internal combustion engines illegal. Just my two cents.