I wouldn't worry about the rust, junkno. Rust forms when moisture comes in contact with the steel. If I recall Abu Dhabi measures its rainfall in inches per century and where Mean Green is driven, Northwest USA, they measure the rain in feet per day!

I know a grand (U$1,000) can be a lot for a student to bear for an exhaust system. [?]
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Inferno Red \'04 GT Autostick, Stage I, BTG exhaust, Airforce One intake, V.A.K. Candy Red upper charge pipe, BTG strut bar,Hyperground, chrome side spears and grill accents.