i just bought a used 07 camry with 50k miles on it. this car was driven in ohio. i noticed that the bolts on the exhaust manifold shields were very rusty. crawled under the car and the exhaust flanges at the cat convertor and muffler were just a big ball of rust. if this had been ignored for another year it would have been very expensive to replace. replaced all rusty bolts and flange gaskets. spray painted flanges and heat shields with hi temp aluminum paint. coated everything with never sieze before installing.