My Flowmaster exhaust system is aluminized. It's been on the car for approx 11 years and 20-25,000 miles. No rust. It looks very similar to the way it did right after it was installed. Even the welds look good. Like yours will, mine has lived a life away from rain and spends it's off time in the basement. I can't see a stainless system rusting, used like I suspect the one on your car will be used....no matter which type of stainless it was bent from.
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frittering and wasting the hours in an off hand way....
1969 GTO, 455ci, 230/236 Pontiac Dude's "Butcher Special" Comp hyd roller cam with Crower HIPPO solid roller lifters, Q-jet, Edelbrock P4B-QJ, Doug's headers, ported 6X-8 (97cc) heads, TKO600, 3.73 geared Eaton Tru-Trac 8.5", hydroboost, rear disc brakes......and my greatest mechanical feat....a new heater core. 
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